diff --git a/config/Migrations/20220404070045_Knowledge.php b/config/Migrations/20220404070045_Knowledge.php
new file mode 100644
index 000000000..e93512664
--- /dev/null
+++ b/config/Migrations/20220404070045_Knowledge.php
@@ -0,0 +1,56 @@
+<?php
+declare(strict_types=1);
+
+use Migrations\AbstractMigration;
+
+class Knowledge extends AbstractMigration
+{
+    public function change()
+    {
+        $sql = "ALTER TABLE `roots` CHANGE `object_type` `object_type` ENUM('pages','users','posts','workshops','events','coaches','votings','photos','info_sheets','knowledges') CHARACTER SET ascii COLLATE ascii_bin NULL DEFAULT NULL;";
+        $this->execute($sql);
+
+        $sql = "CREATE TABLE `knowledges` (
+              `_id` int NOT NULL,
+              `uid` int UNSIGNED DEFAULT NULL,
+              `title` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
+              `text` text,
+              `status` smallint DEFAULT NULL,
+              `owner` int UNSIGNED DEFAULT NULL,
+              `created` datetime DEFAULT NULL,
+              `updated` datetime DEFAULT NULL,
+              `updated_by` int UNSIGNED DEFAULT NULL,
+              `currently_updated_by` int UNSIGNED DEFAULT NULL,
+              `currently_updated_start` datetime DEFAULT NULL
+            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
+
+            CREATE TABLE `knowledges_categories` (
+              `knowledge_uid` int UNSIGNED NOT NULL,
+              `category_id` int UNSIGNED NOT NULL
+            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
+
+            CREATE TABLE `knowledges_skills` (
+              `knowledge_uid` int UNSIGNED NOT NULL,
+              `skill_id` int UNSIGNED NOT NULL
+            ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
+
+            ALTER TABLE `knowledges`
+              ADD PRIMARY KEY (`_id`),
+              ADD KEY `uid` (`uid`);
+
+            ALTER TABLE `knowledges_categories`
+              ADD PRIMARY KEY (`knowledge_uid`,`category_id`),
+              ADD KEY `knowledge_uid` (`knowledge_uid`),
+              ADD KEY `category_id` (`category_id`);
+
+            ALTER TABLE `knowledges_skills`
+              ADD PRIMARY KEY (`knowledge_uid`,`skill_id`),
+              ADD KEY `knowledge_uid` (`knowledge_uid`),
+              ADD KEY `skill_id` (`skill_id`);
+
+            ALTER TABLE `knowledges`
+              MODIFY `_id` int NOT NULL AUTO_INCREMENT;
+            COMMIT;";
+        $this->execute($sql);
+    }
+}
diff --git a/config/Migrations/schema-dump-default.lock b/config/Migrations/schema-dump-default.lock
index f5aa65f6a..8114799f5 100644
Binary files a/config/Migrations/schema-dump-default.lock and b/config/Migrations/schema-dump-default.lock differ
diff --git a/config/routes.php b/config/routes.php
index 5aad87c79..7740ab327 100644
--- a/config/routes.php
+++ b/config/routes.php
@@ -25,6 +25,7 @@
         $routes->redirect('/initiativen', '/orte');
         $routes->redirect('/splitter', '/seite/splitter');
         $routes->redirect('/online-reparaturcafe', '/seite/online-reparaturcafe');
+        $routes->redirect('/seite/reparaturwissen', '/reparaturwissen');
         $routes->redirect('/repair-cafe-ulm', '/reparatur-cafe-ulm');
         /* END custom redirects */
 
@@ -66,6 +67,8 @@
         $routes->connect('/users/passwortAendern', ['controller'=>'users', 'action'=>'passwortAendern']);
         $routes->connect('/users/activate/*', ['controller'=>'users', 'action'=>'activate']);
 
+        $routes->connect('/reparaturwissen', ['controller'=>'knowledges', 'action'=>'all']);
+
         $routes->connect('/users/profile/{id}', ['controller'=>'users', 'action'=>'publicProfile'])
             ->setPatterns(['id' => '\d+'])
             ->setPass(['id']);
diff --git a/config/sql/database.sql b/config/sql/database.sql
index 91e51fc6b..34c6dac3d 100644
--- a/config/sql/database.sql
+++ b/config/sql/database.sql
@@ -1,10 +1,10 @@
 -- phpMyAdmin SQL Dump
--- version 5.1.0
+-- version 5.1.3
 -- https://www.phpmyadmin.net/
 --
 -- Host: localhost
--- Erstellungszeit: 27. Okt 2021 um 09:33
--- Server-Version: 5.7.33-log
+-- Erstellungszeit: 04. Apr 2022 um 09:22
+-- Server-Version: 8.0.28
 -- PHP-Version: 8.0.1
 
 SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
@@ -23,10 +23,10 @@ SET time_zone = "+00:00";
 
 DROP TABLE IF EXISTS `blocked_workshop_slugs`;
 CREATE TABLE `blocked_workshop_slugs` (
-  `id` int(11) NOT NULL,
+  `id` int NOT NULL,
   `url` varchar(255) DEFAULT NULL,
-  `status` tinyint(4) DEFAULT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+  `status` tinyint DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 --
 -- Daten für Tabelle `blocked_workshop_slugs`
@@ -76,11 +76,11 @@ INSERT INTO `blocked_workshop_slugs` (`id`, `url`, `status`) VALUES
 
 DROP TABLE IF EXISTS `blogs`;
 CREATE TABLE `blogs` (
-  `id` int(8) NOT NULL,
+  `id` int NOT NULL,
   `name` varchar(255) DEFAULT NULL,
   `text` text,
   `url` varchar(255) DEFAULT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 --
 -- Daten für Tabelle `blogs`
@@ -98,13 +98,13 @@ INSERT INTO `blogs` (`id`, `name`, `text`, `url`) VALUES
 
 DROP TABLE IF EXISTS `brands`;
 CREATE TABLE `brands` (
-  `id` int(8) NOT NULL,
-  `name` varchar(100) COLLATE utf8_bin DEFAULT NULL,
-  `status` smallint(6) DEFAULT NULL,
-  `owner` int(10) UNSIGNED DEFAULT NULL,
+  `id` int NOT NULL,
+  `name` varchar(100) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,
+  `status` smallint DEFAULT NULL,
+  `owner` int UNSIGNED DEFAULT NULL,
   `created` datetime DEFAULT NULL,
   `modified` datetime DEFAULT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3 COLLATE=utf8_bin;
 
 --
 -- Daten für Tabelle `brands`
@@ -1449,21 +1449,21 @@ INSERT INTO `brands` (`id`, `name`, `status`, `owner`, `created`, `modified`) VA
 
 DROP TABLE IF EXISTS `categories`;
 CREATE TABLE `categories` (
-  `id` int(11) NOT NULL,
-  `name` varchar(100) COLLATE utf8_bin DEFAULT NULL,
-  `icon` varchar(255) COLLATE utf8_bin DEFAULT NULL,
-  `visible_on_platform` tinyint(4) UNSIGNED NOT NULL DEFAULT '1',
+  `id` int NOT NULL,
+  `name` varchar(100) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,
+  `icon` varchar(255) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,
+  `visible_on_platform` tinyint UNSIGNED NOT NULL DEFAULT '1',
   `carbon_footprint` decimal(6,2) UNSIGNED NOT NULL DEFAULT '0.00',
   `material_footprint` decimal(8,2) UNSIGNED NOT NULL DEFAULT '0.00',
-  `parent_id` int(11) DEFAULT NULL,
-  `ords_category_id` int(11) UNSIGNED DEFAULT NULL,
-  `lft` int(11) DEFAULT NULL,
-  `rght` int(11) DEFAULT NULL,
-  `status` smallint(6) DEFAULT NULL,
-  `owner` int(10) UNSIGNED DEFAULT NULL,
+  `parent_id` int DEFAULT NULL,
+  `ords_category_id` int UNSIGNED DEFAULT NULL,
+  `lft` int DEFAULT NULL,
+  `rght` int DEFAULT NULL,
+  `status` smallint DEFAULT NULL,
+  `owner` int UNSIGNED DEFAULT NULL,
   `created` datetime DEFAULT NULL,
   `modified` datetime DEFAULT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3 COLLATE=utf8_bin;
 
 --
 -- Daten für Tabelle `categories`
@@ -1887,12 +1887,12 @@ INSERT INTO `categories` (`id`, `name`, `icon`, `visible_on_platform`, `carbon_f
 
 DROP TABLE IF EXISTS `countries`;
 CREATE TABLE `countries` (
-  `code` char(2) CHARACTER SET utf8 NOT NULL,
-  `iso3` varchar(3) COLLATE utf8_unicode_ci DEFAULT '',
-  `name_en` varchar(50) COLLATE utf8_unicode_ci DEFAULT NULL,
-  `name_de` varchar(50) COLLATE utf8_unicode_ci DEFAULT NULL,
-  `rank` int(4) DEFAULT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci;
+  `code` char(2) CHARACTER SET utf8 COLLATE utf8_general_ci NOT NULL,
+  `iso3` varchar(3) CHARACTER SET utf8 COLLATE utf8_unicode_ci DEFAULT '',
+  `name_en` varchar(50) CHARACTER SET utf8 COLLATE utf8_unicode_ci DEFAULT NULL,
+  `name_de` varchar(50) CHARACTER SET utf8 COLLATE utf8_unicode_ci DEFAULT NULL,
+  `rank` int DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3 COLLATE=utf8_unicode_ci;
 
 --
 -- Daten für Tabelle `countries`
@@ -2151,8 +2151,8 @@ INSERT INTO `countries` (`code`, `iso3`, `name_en`, `name_de`, `rank`) VALUES
 
 DROP TABLE IF EXISTS `events`;
 CREATE TABLE `events` (
-  `_id` int(8) NOT NULL,
-  `uid` int(8) UNSIGNED DEFAULT NULL,
+  `_id` int NOT NULL,
+  `uid` int UNSIGNED DEFAULT NULL,
   `eventbeschreibung` text,
   `datumstart` date DEFAULT NULL,
   `uhrzeitstart` time DEFAULT NULL,
@@ -2165,20 +2165,20 @@ CREATE TABLE `events` (
   `land` varchar(99) DEFAULT NULL,
   `lat` double DEFAULT '0',
   `lng` double DEFAULT '0',
-  `use_custom_coordinates` tinyint(4) UNSIGNED NOT NULL DEFAULT '0',
+  `use_custom_coordinates` tinyint UNSIGNED NOT NULL DEFAULT '0',
   `image` varchar(150) DEFAULT NULL,
   `image_alt_text` varchar(255) DEFAULT NULL,
-  `status` smallint(6) DEFAULT NULL,
-  `owner` int(8) UNSIGNED DEFAULT NULL,
+  `status` smallint DEFAULT NULL,
+  `owner` int UNSIGNED DEFAULT NULL,
   `created` datetime DEFAULT NULL,
   `updated` datetime DEFAULT NULL,
-  `updated_by` int(8) UNSIGNED DEFAULT NULL,
-  `currently_updated_by` int(8) UNSIGNED DEFAULT NULL,
+  `updated_by` int UNSIGNED DEFAULT NULL,
+  `currently_updated_by` int UNSIGNED DEFAULT NULL,
   `currently_updated_start` datetime DEFAULT NULL,
   `lang` varchar(3) DEFAULT NULL,
-  `workshop_uid` int(8) UNSIGNED DEFAULT NULL,
-  `is_online_event` tinyint(4) UNSIGNED NOT NULL DEFAULT '0'
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+  `workshop_uid` int UNSIGNED DEFAULT NULL,
+  `is_online_event` tinyint UNSIGNED NOT NULL DEFAULT '0'
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 -- --------------------------------------------------------
 
@@ -2188,9 +2188,9 @@ CREATE TABLE `events` (
 
 DROP TABLE IF EXISTS `events_categories`;
 CREATE TABLE `events_categories` (
-  `event_uid` int(8) UNSIGNED NOT NULL,
-  `category_id` int(8) UNSIGNED NOT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+  `event_uid` int UNSIGNED NOT NULL,
+  `category_id` int UNSIGNED NOT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 -- --------------------------------------------------------
 
@@ -2200,11 +2200,11 @@ CREATE TABLE `events_categories` (
 
 DROP TABLE IF EXISTS `form_fields`;
 CREATE TABLE `form_fields` (
-  `id` int(11) NOT NULL,
+  `id` int NOT NULL,
   `name` varchar(100) DEFAULT NULL,
   `identifier` varchar(255) DEFAULT NULL,
-  `status` int(11) NOT NULL DEFAULT '1'
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+  `status` int NOT NULL DEFAULT '1'
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 --
 -- Daten für Tabelle `form_fields`
@@ -2226,13 +2226,13 @@ INSERT INTO `form_fields` (`id`, `name`, `identifier`, `status`) VALUES
 
 DROP TABLE IF EXISTS `form_field_options`;
 CREATE TABLE `form_field_options` (
-  `id` int(11) NOT NULL,
-  `form_field_id` int(10) UNSIGNED DEFAULT NULL,
-  `value` int(10) UNSIGNED DEFAULT NULL,
+  `id` int NOT NULL,
+  `form_field_id` int UNSIGNED DEFAULT NULL,
+  `value` int UNSIGNED DEFAULT NULL,
   `name` varchar(100) DEFAULT NULL,
-  `rank` int(10) UNSIGNED DEFAULT NULL,
-  `status` tinyint(4) NOT NULL DEFAULT '1'
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+  `rank` int UNSIGNED DEFAULT NULL,
+  `status` tinyint NOT NULL DEFAULT '1'
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 --
 -- Daten für Tabelle `form_field_options`
@@ -2276,11 +2276,11 @@ INSERT INTO `form_field_options` (`id`, `form_field_id`, `value`, `name`, `rank`
 
 DROP TABLE IF EXISTS `form_field_options_extra_infos`;
 CREATE TABLE `form_field_options_extra_infos` (
-  `id` int(11) NOT NULL,
-  `form_field_options_id` int(10) UNSIGNED NOT NULL,
+  `id` int NOT NULL,
+  `form_field_options_id` int UNSIGNED NOT NULL,
   `repair_status` varchar(40) DEFAULT NULL,
   `repair_barrier_if_end_of_life` varchar(200) DEFAULT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 --
 -- Daten für Tabelle `form_field_options_extra_infos`
@@ -2314,9 +2314,9 @@ INSERT INTO `form_field_options_extra_infos` (`id`, `form_field_options_id`, `re
 
 DROP TABLE IF EXISTS `groups`;
 CREATE TABLE `groups` (
-  `id` int(8) NOT NULL,
+  `id` int NOT NULL,
   `name` varchar(255) DEFAULT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 --
 -- Daten für Tabelle `groups`
@@ -2335,13 +2335,13 @@ INSERT INTO `groups` (`id`, `name`) VALUES
 
 DROP TABLE IF EXISTS `i18n`;
 CREATE TABLE `i18n` (
-  `id` int(10) NOT NULL,
+  `id` int NOT NULL,
   `locale` varchar(6) NOT NULL,
   `model` varchar(255) NOT NULL,
-  `foreign_key` int(10) NOT NULL,
+  `foreign_key` int NOT NULL,
   `field` varchar(255) NOT NULL,
   `content` mediumtext
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 -- --------------------------------------------------------
 
@@ -2351,30 +2351,30 @@ CREATE TABLE `i18n` (
 
 DROP TABLE IF EXISTS `info_sheets`;
 CREATE TABLE `info_sheets` (
-  `_id` int(8) NOT NULL,
-  `uid` int(8) UNSIGNED DEFAULT NULL,
-  `visitor_age` int(10) DEFAULT NULL,
+  `_id` int NOT NULL,
+  `uid` int UNSIGNED DEFAULT NULL,
+  `visitor_age` int DEFAULT NULL,
   `visitor_gender` varchar(1) DEFAULT NULL,
   `device_name` varchar(255) DEFAULT NULL,
-  `device_age` int(10) UNSIGNED DEFAULT NULL,
+  `device_age` int UNSIGNED DEFAULT NULL,
   `defect_description` text,
-  `defect_found` tinyint(4) UNSIGNED DEFAULT NULL,
-  `defect_found_reason` tinyint(4) UNSIGNED DEFAULT NULL,
-  `repair_postponed_reason` tinyint(4) UNSIGNED DEFAULT NULL,
-  `no_repair_reason` tinyint(4) UNSIGNED DEFAULT NULL,
-  `device_must_not_be_used_anymore` tinyint(4) UNSIGNED DEFAULT NULL,
+  `defect_found` tinyint UNSIGNED DEFAULT NULL,
+  `defect_found_reason` tinyint UNSIGNED DEFAULT NULL,
+  `repair_postponed_reason` tinyint UNSIGNED DEFAULT NULL,
+  `no_repair_reason` tinyint UNSIGNED DEFAULT NULL,
+  `device_must_not_be_used_anymore` tinyint UNSIGNED DEFAULT NULL,
   `no_repair_reason_text` varchar(200) DEFAULT NULL,
-  `status` smallint(6) DEFAULT NULL,
-  `owner` int(8) UNSIGNED DEFAULT NULL,
+  `status` smallint DEFAULT NULL,
+  `owner` int UNSIGNED DEFAULT NULL,
   `created` datetime DEFAULT NULL,
   `updated` datetime DEFAULT NULL,
-  `updated_by` int(8) UNSIGNED DEFAULT NULL,
-  `currently_updated_by` int(8) UNSIGNED DEFAULT NULL,
+  `updated_by` int UNSIGNED DEFAULT NULL,
+  `currently_updated_by` int UNSIGNED DEFAULT NULL,
   `currently_updated_start` datetime DEFAULT NULL,
-  `event_uid` int(8) UNSIGNED DEFAULT NULL,
-  `category_id` int(10) DEFAULT NULL,
-  `brand_id` int(10) UNSIGNED DEFAULT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+  `event_uid` int UNSIGNED DEFAULT NULL,
+  `category_id` int DEFAULT NULL,
+  `brand_id` int UNSIGNED DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 -- --------------------------------------------------------
 
@@ -2384,9 +2384,54 @@ CREATE TABLE `info_sheets` (
 
 DROP TABLE IF EXISTS `info_sheets_form_field_options`;
 CREATE TABLE `info_sheets_form_field_options` (
-  `info_sheet_id` int(8) UNSIGNED NOT NULL,
-  `form_field_option_id` int(8) UNSIGNED NOT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+  `info_sheet_id` int UNSIGNED NOT NULL,
+  `form_field_option_id` int UNSIGNED NOT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
+
+-- --------------------------------------------------------
+
+--
+-- Tabellenstruktur für Tabelle `knowledges`
+--
+
+DROP TABLE IF EXISTS `knowledges`;
+CREATE TABLE `knowledges` (
+  `_id` int NOT NULL,
+  `uid` int UNSIGNED DEFAULT NULL,
+  `title` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
+  `text` text,
+  `status` smallint DEFAULT NULL,
+  `owner` int UNSIGNED DEFAULT NULL,
+  `created` datetime DEFAULT NULL,
+  `updated` datetime DEFAULT NULL,
+  `updated_by` int UNSIGNED DEFAULT NULL,
+  `currently_updated_by` int UNSIGNED DEFAULT NULL,
+  `currently_updated_start` datetime DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
+
+-- --------------------------------------------------------
+
+--
+-- Tabellenstruktur für Tabelle `knowledges_categories`
+--
+
+DROP TABLE IF EXISTS `knowledges_categories`;
+CREATE TABLE `knowledges_categories` (
+  `knowledge_uid` int UNSIGNED NOT NULL,
+  `category_id` int UNSIGNED NOT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
+
+-- --------------------------------------------------------
+
+--
+-- Tabellenstruktur für Tabelle `knowledges_skills`
+--
+
+DROP TABLE IF EXISTS `knowledges_skills`;
+CREATE TABLE `knowledges_skills` (
+  `knowledge_uid` int UNSIGNED NOT NULL,
+  `skill_id` int UNSIGNED NOT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 -- --------------------------------------------------------
 
@@ -2396,12 +2441,12 @@ CREATE TABLE `info_sheets_form_field_options` (
 
 DROP TABLE IF EXISTS `metatags`;
 CREATE TABLE `metatags` (
-  `id` int(10) UNSIGNED NOT NULL,
-  `object_uid` int(10) UNSIGNED DEFAULT NULL,
+  `id` int UNSIGNED NOT NULL,
+  `object_uid` int UNSIGNED DEFAULT NULL,
   `title` varchar(255) DEFAULT NULL,
   `description` varchar(255) DEFAULT NULL,
   `keywords` varchar(255) DEFAULT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 -- --------------------------------------------------------
 
@@ -2411,13 +2456,13 @@ CREATE TABLE `metatags` (
 
 DROP TABLE IF EXISTS `newsletters`;
 CREATE TABLE `newsletters` (
-  `id` int(255) NOT NULL,
+  `id` int NOT NULL,
   `email` varchar(255) DEFAULT NULL,
   `plz` varchar(8) DEFAULT NULL,
   `created` datetime DEFAULT NULL,
   `confirm` text NOT NULL,
   `unsub` text NOT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 -- --------------------------------------------------------
 
@@ -2427,13 +2472,13 @@ CREATE TABLE `newsletters` (
 
 DROP TABLE IF EXISTS `ords_categories`;
 CREATE TABLE `ords_categories` (
-  `id` int(11) NOT NULL,
-  `name` varchar(100) COLLATE utf8_bin DEFAULT NULL,
-  `status` smallint(6) DEFAULT NULL,
-  `owner` int(10) UNSIGNED DEFAULT NULL,
+  `id` int NOT NULL,
+  `name` varchar(100) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,
+  `status` smallint DEFAULT NULL,
+  `owner` int UNSIGNED DEFAULT NULL,
   `created` datetime DEFAULT NULL,
   `modified` datetime DEFAULT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3 COLLATE=utf8_bin;
 
 --
 -- Daten für Tabelle `ords_categories`
@@ -2489,25 +2534,25 @@ INSERT INTO `ords_categories` (`id`, `name`, `status`, `owner`, `created`, `modi
 
 DROP TABLE IF EXISTS `pages`;
 CREATE TABLE `pages` (
-  `_id` int(8) NOT NULL,
-  `uid` int(8) UNSIGNED DEFAULT NULL,
+  `_id` int NOT NULL,
+  `uid` int UNSIGNED DEFAULT NULL,
   `name` varchar(255) DEFAULT NULL,
   `text` text,
   `url` varchar(255) DEFAULT NULL,
-  `status` smallint(6) DEFAULT NULL,
-  `owner` int(8) UNSIGNED DEFAULT NULL,
+  `status` smallint DEFAULT NULL,
+  `owner` int UNSIGNED DEFAULT NULL,
   `created` datetime DEFAULT NULL,
   `updated` datetime DEFAULT NULL,
-  `updated_by` int(8) UNSIGNED DEFAULT NULL,
-  `currently_updated_by` int(8) UNSIGNED DEFAULT NULL,
+  `updated_by` int UNSIGNED DEFAULT NULL,
+  `currently_updated_by` int UNSIGNED DEFAULT NULL,
   `currently_updated_start` datetime DEFAULT NULL,
   `lang` varchar(3) DEFAULT NULL,
-  `position` int(10) UNSIGNED DEFAULT NULL,
+  `position` int UNSIGNED DEFAULT NULL,
   `menu_type` varchar(255) NOT NULL DEFAULT 'no-menu',
-  `parent_uid` int(10) UNSIGNED DEFAULT NULL,
-  `lft` int(10) DEFAULT NULL,
-  `rght` int(10) DEFAULT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+  `parent_uid` int UNSIGNED DEFAULT NULL,
+  `lft` int DEFAULT NULL,
+  `rght` int DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 --
 -- Daten für Tabelle `pages`
@@ -2527,12 +2572,12 @@ INSERT INTO `pages` (`_id`, `uid`, `name`, `text`, `url`, `status`, `owner`, `cr
 
 DROP TABLE IF EXISTS `phinxlog`;
 CREATE TABLE `phinxlog` (
-  `version` bigint(20) NOT NULL,
+  `version` bigint NOT NULL,
   `migration_name` varchar(100) DEFAULT NULL,
   `start_time` timestamp NULL DEFAULT NULL,
   `end_time` timestamp NULL DEFAULT NULL,
   `breakpoint` tinyint(1) NOT NULL DEFAULT '0'
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 --
 -- Daten für Tabelle `phinxlog`
@@ -2547,7 +2592,8 @@ INSERT INTO `phinxlog` (`version`, `migration_name`, `start_time`, `end_time`, `
 (20210816093411, 'RenameTable', '2021-08-20 07:42:38', '2021-08-20 07:42:38', 0),
 (20210818075040, 'AddIso3CodeToCountries', '2021-08-20 07:42:38', '2021-08-20 07:42:39', 0),
 (20210927124302, 'GeoDataForUsers', '2021-10-27 07:33:29', '2021-10-27 07:33:30', 0),
-(20220321084056, 'ChangeZeroDatesForMySql8', '2022-03-21 07:33:29', '2022-03-21 07:33:30', 0);
+(20220321084056, 'ChangeZeroDatesForMySql8', '2022-03-21 07:33:29', '2022-03-21 07:33:30', 0),
+(20220404070045, 'Knowledge', '2022-04-04 07:22:11', '2022-04-04 07:22:12', 0);
 
 -- --------------------------------------------------------
 
@@ -2557,21 +2603,21 @@ INSERT INTO `phinxlog` (`version`, `migration_name`, `start_time`, `end_time`, `
 
 DROP TABLE IF EXISTS `photos`;
 CREATE TABLE `photos` (
-  `_id` int(8) NOT NULL,
-  `uid` int(8) UNSIGNED DEFAULT NULL,
-  `object_uid` int(8) UNSIGNED DEFAULT NULL,
+  `_id` int NOT NULL,
+  `uid` int UNSIGNED DEFAULT NULL,
+  `object_uid` int UNSIGNED DEFAULT NULL,
   `object_type` enum('pages','posts','workshops','events') CHARACTER SET ascii COLLATE ascii_bin DEFAULT NULL,
   `name` varchar(255) DEFAULT NULL,
   `text` text NOT NULL,
-  `rank` int(8) UNSIGNED DEFAULT NULL,
-  `status` smallint(6) DEFAULT NULL,
-  `owner` int(8) UNSIGNED DEFAULT NULL,
+  `rank` int UNSIGNED DEFAULT NULL,
+  `status` smallint DEFAULT NULL,
+  `owner` int UNSIGNED DEFAULT NULL,
   `created` datetime DEFAULT NULL,
   `updated` datetime DEFAULT NULL,
-  `updated_by` int(8) UNSIGNED DEFAULT NULL,
-  `currently_updated_by` int(8) UNSIGNED DEFAULT NULL,
+  `updated_by` int UNSIGNED DEFAULT NULL,
+  `currently_updated_by` int UNSIGNED DEFAULT NULL,
   `currently_updated_start` datetime DEFAULT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 -- --------------------------------------------------------
 
@@ -2581,9 +2627,9 @@ CREATE TABLE `photos` (
 
 DROP TABLE IF EXISTS `posts`;
 CREATE TABLE `posts` (
-  `_id` int(8) NOT NULL,
-  `uid` int(8) UNSIGNED DEFAULT NULL,
-  `blog_id` int(8) UNSIGNED DEFAULT NULL,
+  `_id` int NOT NULL,
+  `uid` int UNSIGNED DEFAULT NULL,
+  `blog_id` int UNSIGNED DEFAULT NULL,
   `name` varchar(255) DEFAULT NULL,
   `text` text,
   `url` varchar(255) DEFAULT NULL,
@@ -2592,14 +2638,14 @@ CREATE TABLE `posts` (
   `image` varchar(150) DEFAULT NULL,
   `image_alt_text` varchar(255) DEFAULT NULL,
   `publish` date DEFAULT NULL,
-  `status` smallint(6) DEFAULT NULL,
-  `owner` int(8) UNSIGNED DEFAULT NULL,
+  `status` smallint DEFAULT NULL,
+  `owner` int UNSIGNED DEFAULT NULL,
   `created` datetime DEFAULT NULL,
   `updated` datetime DEFAULT NULL,
-  `updated_by` int(8) UNSIGNED DEFAULT NULL,
-  `currently_updated_by` int(8) UNSIGNED DEFAULT NULL,
+  `updated_by` int UNSIGNED DEFAULT NULL,
+  `currently_updated_by` int UNSIGNED DEFAULT NULL,
   `currently_updated_start` datetime DEFAULT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 -- --------------------------------------------------------
 
@@ -2609,9 +2655,9 @@ CREATE TABLE `posts` (
 
 DROP TABLE IF EXISTS `roots`;
 CREATE TABLE `roots` (
-  `uid` int(8) UNSIGNED NOT NULL,
-  `object_type` enum('pages','users','posts','workshops','events','coaches','votings','photos','info_sheets') CHARACTER SET ascii COLLATE ascii_bin DEFAULT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+  `uid` int UNSIGNED NOT NULL,
+  `object_type` enum('pages','users','posts','workshops','events','coaches','votings','photos','info_sheets','knowledges') CHARACTER SET ascii COLLATE ascii_bin DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 --
 -- Daten für Tabelle `roots`
@@ -2704,13 +2750,13 @@ INSERT INTO `roots` (`uid`, `object_type`) VALUES
 
 DROP TABLE IF EXISTS `skills`;
 CREATE TABLE `skills` (
-  `id` int(11) NOT NULL,
-  `name` varchar(100) COLLATE utf8_bin DEFAULT NULL,
-  `status` smallint(6) DEFAULT NULL,
-  `owner` int(10) UNSIGNED DEFAULT NULL,
+  `id` int NOT NULL,
+  `name` varchar(100) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL,
+  `status` smallint DEFAULT NULL,
+  `owner` int UNSIGNED DEFAULT NULL,
   `created` datetime DEFAULT NULL,
   `modified` datetime DEFAULT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3 COLLATE=utf8_bin;
 
 -- --------------------------------------------------------
 
@@ -2720,12 +2766,12 @@ CREATE TABLE `skills` (
 
 DROP TABLE IF EXISTS `third_party_statistics`;
 CREATE TABLE `third_party_statistics` (
-  `id` int(11) NOT NULL,
-  `category_id` int(10) UNSIGNED DEFAULT NULL,
+  `id` int NOT NULL,
+  `category_id` int UNSIGNED DEFAULT NULL,
   `date_from` date DEFAULT NULL,
   `date_to` date DEFAULT NULL,
-  `repaired` int(10) UNSIGNED DEFAULT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+  `repaired` int UNSIGNED DEFAULT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 -- --------------------------------------------------------
 
@@ -2735,8 +2781,8 @@ CREATE TABLE `third_party_statistics` (
 
 DROP TABLE IF EXISTS `users`;
 CREATE TABLE `users` (
-  `_id` int(8) NOT NULL,
-  `uid` int(8) UNSIGNED DEFAULT NULL,
+  `_id` int NOT NULL,
+  `uid` int UNSIGNED DEFAULT NULL,
   `password` char(60) DEFAULT NULL,
   `email` varchar(255) DEFAULT NULL,
   `nick` varchar(25) DEFAULT NULL,
@@ -2755,20 +2801,20 @@ CREATE TABLE `users` (
   `feed_url` varchar(99) DEFAULT NULL,
   `facebook_username` varchar(99) DEFAULT NULL,
   `additional_contact` varchar(255) DEFAULT NULL,
-  `status` smallint(6) DEFAULT NULL,
-  `owner` int(8) UNSIGNED DEFAULT NULL,
+  `status` smallint DEFAULT NULL,
+  `owner` int UNSIGNED DEFAULT NULL,
   `created` datetime DEFAULT NULL,
   `updated` datetime DEFAULT NULL,
-  `updated_by` int(8) UNSIGNED DEFAULT NULL,
-  `currently_updated_by` int(8) UNSIGNED DEFAULT NULL,
+  `updated_by` int UNSIGNED DEFAULT NULL,
+  `currently_updated_by` int UNSIGNED DEFAULT NULL,
   `currently_updated_start` datetime DEFAULT NULL,
   `image` varchar(255) DEFAULT NULL,
   `image_alt_text` varchar(99) DEFAULT NULL,
   `lang` varchar(3) DEFAULT NULL,
   `private` text,
   `confirm` text,
-  `privacy_policy_accepted` tinyint(4) UNSIGNED NOT NULL DEFAULT '0'
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+  `privacy_policy_accepted` tinyint UNSIGNED NOT NULL DEFAULT '0'
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 -- --------------------------------------------------------
 
@@ -2778,9 +2824,9 @@ CREATE TABLE `users` (
 
 DROP TABLE IF EXISTS `users_categories`;
 CREATE TABLE `users_categories` (
-  `user_uid` int(8) UNSIGNED NOT NULL,
-  `category_id` int(8) UNSIGNED NOT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+  `user_uid` int UNSIGNED NOT NULL,
+  `category_id` int UNSIGNED NOT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 -- --------------------------------------------------------
 
@@ -2790,9 +2836,9 @@ CREATE TABLE `users_categories` (
 
 DROP TABLE IF EXISTS `users_groups`;
 CREATE TABLE `users_groups` (
-  `user_uid` int(8) NOT NULL,
-  `group_id` int(8) NOT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+  `user_uid` int NOT NULL,
+  `group_id` int NOT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 -- --------------------------------------------------------
 
@@ -2802,9 +2848,9 @@ CREATE TABLE `users_groups` (
 
 DROP TABLE IF EXISTS `users_skills`;
 CREATE TABLE `users_skills` (
-  `user_uid` int(8) UNSIGNED NOT NULL,
-  `skill_id` int(8) UNSIGNED NOT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+  `user_uid` int UNSIGNED NOT NULL,
+  `skill_id` int UNSIGNED NOT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 -- --------------------------------------------------------
 
@@ -2814,11 +2860,11 @@ CREATE TABLE `users_skills` (
 
 DROP TABLE IF EXISTS `users_workshops`;
 CREATE TABLE `users_workshops` (
-  `user_uid` int(8) NOT NULL,
-  `workshop_uid` int(8) NOT NULL,
+  `user_uid` int NOT NULL,
+  `workshop_uid` int NOT NULL,
   `created` datetime DEFAULT NULL,
   `approved` datetime DEFAULT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 -- --------------------------------------------------------
 
@@ -2828,14 +2874,14 @@ CREATE TABLE `users_workshops` (
 
 DROP TABLE IF EXISTS `worknews`;
 CREATE TABLE `worknews` (
-  `id` int(255) NOT NULL,
-  `workshop_uid` int(8) NOT NULL,
+  `id` int NOT NULL,
+  `workshop_uid` int NOT NULL,
   `email` varchar(255) NOT NULL,
   `created` datetime DEFAULT NULL,
   `modified` datetime DEFAULT NULL,
   `confirm` text,
   `unsub` text
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 -- --------------------------------------------------------
 
@@ -2845,8 +2891,8 @@ CREATE TABLE `worknews` (
 
 DROP TABLE IF EXISTS `workshops`;
 CREATE TABLE `workshops` (
-  `_id` int(8) NOT NULL,
-  `uid` int(8) UNSIGNED DEFAULT NULL,
+  `_id` int NOT NULL,
+  `uid` int UNSIGNED DEFAULT NULL,
   `name` varchar(255) DEFAULT NULL,
   `text` text,
   `url` varchar(255) DEFAULT NULL,
@@ -2863,23 +2909,23 @@ CREATE TABLE `workshops` (
   `additional_contact` varchar(255) DEFAULT NULL,
   `image` varchar(150) DEFAULT NULL,
   `image_alt_text` varchar(255) DEFAULT NULL,
-  `use_custom_coordinates` tinyint(4) UNSIGNED NOT NULL DEFAULT '0',
+  `use_custom_coordinates` tinyint UNSIGNED NOT NULL DEFAULT '0',
   `lat` double DEFAULT '0',
   `lng` double DEFAULT '0',
   `traeger` varchar(255) DEFAULT NULL,
   `rechtsform` varchar(255) DEFAULT NULL,
   `rechtl_vertret` varchar(255) DEFAULT NULL,
-  `show_statistics` tinyint(3) UNSIGNED NOT NULL DEFAULT '1',
-  `status` smallint(6) DEFAULT NULL,
-  `owner` int(8) UNSIGNED DEFAULT NULL,
+  `show_statistics` tinyint UNSIGNED NOT NULL DEFAULT '1',
+  `status` smallint DEFAULT NULL,
+  `owner` int UNSIGNED DEFAULT NULL,
   `created` datetime DEFAULT NULL,
   `updated` datetime DEFAULT NULL,
-  `updated_by` int(8) UNSIGNED DEFAULT NULL,
-  `currently_updated_by` int(8) UNSIGNED DEFAULT NULL,
+  `updated_by` int UNSIGNED DEFAULT NULL,
+  `currently_updated_by` int UNSIGNED DEFAULT NULL,
   `currently_updated_start` datetime DEFAULT NULL,
   `lang` varchar(3) DEFAULT NULL,
   `other_users` text
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 -- --------------------------------------------------------
 
@@ -2889,9 +2935,9 @@ CREATE TABLE `workshops` (
 
 DROP TABLE IF EXISTS `workshops_categories`;
 CREATE TABLE `workshops_categories` (
-  `workshop_uid` int(8) UNSIGNED NOT NULL,
-  `category_id` int(8) UNSIGNED NOT NULL
-) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+  `workshop_uid` int UNSIGNED NOT NULL,
+  `category_id` int UNSIGNED NOT NULL
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb3;
 
 --
 -- Indizes der exportierten Tabellen
@@ -2990,6 +3036,29 @@ ALTER TABLE `info_sheets`
 ALTER TABLE `info_sheets_form_field_options`
   ADD PRIMARY KEY (`info_sheet_id`,`form_field_option_id`);
 
+--
+-- Indizes für die Tabelle `knowledges`
+--
+ALTER TABLE `knowledges`
+  ADD PRIMARY KEY (`_id`),
+  ADD KEY `uid` (`uid`);
+
+--
+-- Indizes für die Tabelle `knowledges_categories`
+--
+ALTER TABLE `knowledges_categories`
+  ADD PRIMARY KEY (`knowledge_uid`,`category_id`),
+  ADD KEY `knowledge_uid` (`knowledge_uid`),
+  ADD KEY `category_id` (`category_id`);
+
+--
+-- Indizes für die Tabelle `knowledges_skills`
+--
+ALTER TABLE `knowledges_skills`
+  ADD PRIMARY KEY (`knowledge_uid`,`skill_id`),
+  ADD KEY `knowledge_uid` (`knowledge_uid`),
+  ADD KEY `skill_id` (`skill_id`);
+
 --
 -- Indizes für die Tabelle `metatags`
 --
@@ -3119,137 +3188,143 @@ ALTER TABLE `workshops_categories`
 -- AUTO_INCREMENT für Tabelle `blocked_workshop_slugs`
 --
 ALTER TABLE `blocked_workshop_slugs`
-  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=36;
+  MODIFY `id` int NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=36;
 
 --
 -- AUTO_INCREMENT für Tabelle `blogs`
 --
 ALTER TABLE `blogs`
-  MODIFY `id` int(8) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=3;
+  MODIFY `id` int NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=3;
 
 --
 -- AUTO_INCREMENT für Tabelle `brands`
 --
 ALTER TABLE `brands`
-  MODIFY `id` int(8) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=1347;
+  MODIFY `id` int NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=1347;
 
 --
 -- AUTO_INCREMENT für Tabelle `categories`
 --
 ALTER TABLE `categories`
-  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=801;
+  MODIFY `id` int NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=801;
 
 --
 -- AUTO_INCREMENT für Tabelle `events`
 --
 ALTER TABLE `events`
-  MODIFY `_id` int(8) NOT NULL AUTO_INCREMENT;
+  MODIFY `_id` int NOT NULL AUTO_INCREMENT;
 
 --
 -- AUTO_INCREMENT für Tabelle `form_fields`
 --
 ALTER TABLE `form_fields`
-  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=7;
+  MODIFY `id` int NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=7;
 
 --
 -- AUTO_INCREMENT für Tabelle `form_field_options`
 --
 ALTER TABLE `form_field_options`
-  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=29;
+  MODIFY `id` int NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=29;
 
 --
 -- AUTO_INCREMENT für Tabelle `form_field_options_extra_infos`
 --
 ALTER TABLE `form_field_options_extra_infos`
-  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=19;
+  MODIFY `id` int NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=19;
 
 --
 -- AUTO_INCREMENT für Tabelle `groups`
 --
 ALTER TABLE `groups`
-  MODIFY `id` int(8) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=11;
+  MODIFY `id` int NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=11;
 
 --
 -- AUTO_INCREMENT für Tabelle `i18n`
 --
 ALTER TABLE `i18n`
-  MODIFY `id` int(10) NOT NULL AUTO_INCREMENT;
+  MODIFY `id` int NOT NULL AUTO_INCREMENT;
 
 --
 -- AUTO_INCREMENT für Tabelle `info_sheets`
 --
 ALTER TABLE `info_sheets`
-  MODIFY `_id` int(8) NOT NULL AUTO_INCREMENT;
+  MODIFY `_id` int NOT NULL AUTO_INCREMENT;
+
+--
+-- AUTO_INCREMENT für Tabelle `knowledges`
+--
+ALTER TABLE `knowledges`
+  MODIFY `_id` int NOT NULL AUTO_INCREMENT;
 
 --
 -- AUTO_INCREMENT für Tabelle `metatags`
 --
 ALTER TABLE `metatags`
-  MODIFY `id` int(10) UNSIGNED NOT NULL AUTO_INCREMENT;
+  MODIFY `id` int UNSIGNED NOT NULL AUTO_INCREMENT;
 
 --
 -- AUTO_INCREMENT für Tabelle `newsletters`
 --
 ALTER TABLE `newsletters`
-  MODIFY `id` int(255) NOT NULL AUTO_INCREMENT;
+  MODIFY `id` int NOT NULL AUTO_INCREMENT;
 
 --
 -- AUTO_INCREMENT für Tabelle `ords_categories`
 --
 ALTER TABLE `ords_categories`
-  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=41;
+  MODIFY `id` int NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=41;
 
 --
 -- AUTO_INCREMENT für Tabelle `pages`
 --
 ALTER TABLE `pages`
-  MODIFY `_id` int(8) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=135;
+  MODIFY `_id` int NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=135;
 
 --
 -- AUTO_INCREMENT für Tabelle `photos`
 --
 ALTER TABLE `photos`
-  MODIFY `_id` int(8) NOT NULL AUTO_INCREMENT;
+  MODIFY `_id` int NOT NULL AUTO_INCREMENT;
 
 --
 -- AUTO_INCREMENT für Tabelle `posts`
 --
 ALTER TABLE `posts`
-  MODIFY `_id` int(8) NOT NULL AUTO_INCREMENT;
+  MODIFY `_id` int NOT NULL AUTO_INCREMENT;
 
 --
 -- AUTO_INCREMENT für Tabelle `roots`
 --
 ALTER TABLE `roots`
-  MODIFY `uid` int(8) UNSIGNED NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=27830;
+  MODIFY `uid` int UNSIGNED NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=27830;
 
 --
 -- AUTO_INCREMENT für Tabelle `skills`
 --
 ALTER TABLE `skills`
-  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT;
+  MODIFY `id` int NOT NULL AUTO_INCREMENT;
 
 --
 -- AUTO_INCREMENT für Tabelle `third_party_statistics`
 --
 ALTER TABLE `third_party_statistics`
-  MODIFY `id` int(11) NOT NULL AUTO_INCREMENT;
+  MODIFY `id` int NOT NULL AUTO_INCREMENT;
 
 --
 -- AUTO_INCREMENT für Tabelle `users`
 --
 ALTER TABLE `users`
-  MODIFY `_id` int(8) NOT NULL AUTO_INCREMENT;
+  MODIFY `_id` int NOT NULL AUTO_INCREMENT;
 
 --
 -- AUTO_INCREMENT für Tabelle `worknews`
 --
 ALTER TABLE `worknews`
-  MODIFY `id` int(255) NOT NULL AUTO_INCREMENT;
+  MODIFY `id` int NOT NULL AUTO_INCREMENT;
 
 --
 -- AUTO_INCREMENT für Tabelle `workshops`
 --
 ALTER TABLE `workshops`
-  MODIFY `_id` int(8) NOT NULL AUTO_INCREMENT;
+  MODIFY `_id` int NOT NULL AUTO_INCREMENT;
 COMMIT;
diff --git a/plugins/Admin/src/Controller/KnowledgesController.php b/plugins/Admin/src/Controller/KnowledgesController.php
new file mode 100644
index 000000000..a788112c6
--- /dev/null
+++ b/plugins/Admin/src/Controller/KnowledgesController.php
@@ -0,0 +1,115 @@
+<?php
+namespace Admin\Controller;
+
+use Cake\Http\Exception\NotFoundException;
+
+class KnowledgesController extends AdminAppController
+{
+
+    public function __construct($request = null, $response = null)
+    {
+        parent::__construct($request, $response);
+        $this->Knowledge = $this->getTableLocator()->get('Knowledges');
+    }
+
+    public function insert()
+    {
+        $knowledge = [
+            'name' => 'Neuer Reparaturwissens-Beitrag von ' . $this->AppAuth->getUserName(),
+        ];
+        $entity = $this->Knowledge->newEntity($knowledge);
+        $knowledge = $this->Knowledge->save($entity);
+        $this->AppFlash->setFlashMessage('Knowledge erfolgreich erstellt. UID: ' . $knowledge->uid); // uid for fixture
+        $this->redirect($this->getReferer());
+    }
+
+    public function edit($uid)
+    {
+
+        if (empty($uid)) {
+            throw new NotFoundException;
+        }
+
+        $knowledge = $this->Knowledge->find('all', [
+            'conditions' => [
+                'Knowledges.uid' => $uid,
+                'Knowledges.status >= ' . APP_DELETED
+            ],
+            'contain' => [
+                'Categories',
+                'Skills',
+            ]
+        ])->first();
+
+        if (empty($knowledge)) {
+            throw new NotFoundException;
+        }
+
+        $this->set('uid', $uid);
+
+        $this->setReferer();
+        $this->setIsCurrentlyUpdated($uid);
+
+        if (!empty($this->request->getData())) {
+
+            $this->Skill = $this->getTableLocator()->get('Skills');
+            $this->request = $this->Skill->addSkills($this->request, $this->AppAuth, 'Knowledges');
+
+            $patchedEntity = $this->Knowledge->getPatchedEntityForAdminEdit($knowledge, $this->request->getData(), $this->useDefaultValidation);
+
+            if (!($patchedEntity->hasErrors())) {
+                $patchedEntity = $this->patchEntityWithCurrentlyUpdatedFields($patchedEntity);
+                $this->saveObject($patchedEntity, $this->useDefaultValidation);
+            } else {
+                $knowledge = $patchedEntity;
+            }
+        }
+
+        $this->set('knowledge', $knowledge);
+
+        $this->Category = $this->getTableLocator()->get('Categories');
+        $this->set('categories', $this->Category->getForDropdown(APP_ON));
+
+        $this->Skill = $this->getTableLocator()->get('Skills');
+        $skillsForDropdown = $this->Skill->getForDropdown(false);
+        $this->set('skillsForDropdown', $skillsForDropdown);
+
+    }
+
+    public function index()
+    {
+        parent::index();
+
+        $conditions = [
+            'Knowledges.status > ' . APP_DELETED
+        ];
+        $conditions = array_merge($this->conditions, $conditions);
+
+        $query = $this->Knowledge->find('all', [
+            'conditions' => $conditions,
+            'contain' => [
+                'Categories',
+                'OwnerUsers',
+                'Skills',
+            ]
+        ]);
+
+        $objects = $this->paginate($query, [
+            'order' => [
+                'Knowledges.uid' => 'ASC'
+            ]
+        ]);
+        foreach($objects as $object) {
+            if ($object->owner_user) {
+                $object->owner_user->revertPrivatizeData();
+            }
+        }
+        $this->set('objects', $objects->toArray());
+
+        $metaTags = [
+            'title' => 'Reparaturwissen'
+        ];
+        $this->set('metaTags', $metaTags);
+
+    }
+}
diff --git a/plugins/Admin/templates/Knowledges/edit.php b/plugins/Admin/templates/Knowledges/edit.php
new file mode 100644
index 000000000..36a5453ed
--- /dev/null
+++ b/plugins/Admin/templates/Knowledges/edit.php
@@ -0,0 +1,79 @@
+<?php
+use Cake\Core\Configure;
+
+    $this->element('addScript', array('script' =>
+        JS_NAMESPACE.".Helper.doCurrentlyUpdatedActions(".$isCurrentlyUpdated.");".
+        JS_NAMESPACE.".Helper.bindCancelButton(".$uid.");".
+        JS_NAMESPACE.".Helper.layoutEditButtons();
+    "));
+    echo $this->element('highlightNavi', ['main' => 'Reparaturwissen']);
+?>
+
+<div class="admin edit">
+
+        <div class="edit">
+
+        <?php echo $this->element('heading', ['first' => 'Reparaturwissens-Beitrag bearbeiten']); ?>
+
+        <?php
+            echo $this->Form->create(
+                $knowledge,
+                [
+                    'novalidate' => 'novalidate',
+                    'id' => 'knowledgeEditForm'
+                ]
+            );
+            echo $this->Form->hidden('referer', ['value' => $referer]);
+            $this->Form->unlockField('referer');
+
+            echo $this->Form->control('Knowledges.title', ['label' => 'Titel']).'<br />';
+            echo $this->Form->control('Knowledges.status', ['type' => 'select', 'options' => Configure::read('AppConfig.status')]).'<br />';
+
+            echo $this->element('metatagsFormfields', ['entity' => 'Knowledges']);
+
+
+            echo '<div class="categories-checkbox-wrapper">';
+                echo '<b id="knowledges-categories" class="pseudo-field">Reparatur-Kenntnisse</b>';
+                echo $this->Form->control('Knowledges.categories._ids', [
+                    'multiple' => 'checkbox',
+                    'label' => false,
+                ]);
+            echo '</div>';
+            echo '<div class="sc"></div>';
+
+            echo '<div class="skills-wrapper">';
+                echo '<b id="knowledges-skills" class="pseudo-field">Weitere Kenntnisse / Interessen</b>';
+                echo $this->Form->control('Knowledges.skills._ids', [
+                    'multiple' => 'select',
+                    'data-tags' => true,
+                    'data-token-separators' => "[',']",
+                    'label' => false,
+                    'options' => $skillsForDropdown,
+                ]);
+            echo '</div>';
+
+        ?>
+    </div>
+
+    <?php
+        echo $this->element('cancelAndSaveButton');
+    ?>
+    <div class="ckeditor-edit">
+      <?php
+        echo $this->element('ckeditorEdit', [
+           'value' => $knowledge->text,
+           'name' => 'Knowledges.text',
+           'uid' => $uid,
+           'objectType' => 'knowledges'
+         ]
+       );
+      ?>
+    </div>
+
+      <?php
+        echo $this->Form->end();
+      ?>
+
+</div>
+
+<div class="sc"></div> <?php /* wegen ckeditor */ ?>
\ No newline at end of file
diff --git a/plugins/Admin/templates/Knowledges/index.php b/plugins/Admin/templates/Knowledges/index.php
new file mode 100644
index 000000000..2aae33722
--- /dev/null
+++ b/plugins/Admin/templates/Knowledges/index.php
@@ -0,0 +1,20 @@
+<?php
+    echo $this->element('highlightNavi', ['main' => 'Reparaturwissen']);
+    echo $this->element('list', [
+       'objects' => $objects,
+       'heading' => 'Reparaturwissen',
+       'newMethod' => ['url' => 'urlKnowledgeNew'],
+       'editMethod' => ['url' => 'urlKnowledgeEdit'],
+       'showMethod' => ['url' => 'urlKnowledgeDetail'],
+       'fields' => [
+            ['name' => 'uid', 'label' => 'UID'],
+            ['name' => 'title', 'label' => 'Titel'],
+            ['name' => 'Categories.name', 'type' => 'habtm', 'label' => 'Kategorien'],
+            ['name' => 'Skills.name', 'type' => 'habtm', 'label' => 'Kenntnisse'],
+            ['name' => 'owner_user.name', 'label' => 'Owner'],
+            ['name' => 'created', 'type' => 'datetime', 'label' => 'erstellt'],
+            ['name' => 'updated', 'type' => 'datetime', 'label' => 'geändert'],
+        ],
+      ],
+    );
+?>
\ No newline at end of file
diff --git a/plugins/Admin/templates/element/core/navi.php b/plugins/Admin/templates/element/core/navi.php
index 613c89c25..64c5ceb7d 100644
--- a/plugins/Admin/templates/element/core/navi.php
+++ b/plugins/Admin/templates/element/core/navi.php
@@ -1,52 +1,58 @@
 <?php
 echo $this->Html->createMenuEntry(array(
-    'name' => 'Posts',
-    'url' => '/admin/posts/index/?val-opt-2=1&key-opt-2=Posts.blog_id',
+    'name' => 'Kategorien',
+    'url' => '/admin/categories/index',
     'level' => 'main'
 ));
 echo $this->Html->createMenuEntry(array(
-    'name' => 'Seiten',
-    'url' => '/admin/pages/index',
+    'name' => 'Kenntnisse',
+    'url' => '/admin/skills/index',
     'level' => 'main'
 ));
 echo $this->Html->createMenuEntry(array(
-    'name' => 'User',
-    'url' => '/admin/users/index',
+    'name' => 'Laufzettel',
+    'url' => '/admin/info-sheets/index',
     'level' => 'main'
 ));
 echo $this->Html->createMenuEntry(array(
-    'name' => 'Termine',
-    'url' => '/admin/events/index?val-status=1&key-status=Events.status',
+    'name' => 'Marken',
+    'url' => '/admin/brands/index?sort=status&direction=asc',
     'level' => 'main'
 ));
 echo $this->Html->createMenuEntry(array(
-    'name' => 'Rep-Inis',
-    'url' => '/admin/workshops/index',
+    'name' => 'Posts',
+    'url' => '/admin/posts/index/?val-opt-2=1&key-opt-2=Posts.blog_id',
     'level' => 'main'
 ));
 echo $this->Html->createMenuEntry(array(
-    'name' => 'Kategorien',
-    'url' => '/admin/categories/index',
+    'name' => 'ORDS',
+    'url' => '/admin/ordsCategories/index',
     'level' => 'main'
 ));
 echo $this->Html->createMenuEntry(array(
-    'name' => 'ORDS',
-    'url' => '/admin/ordsCategories/index',
+    'name' => 'Reparatur-Initiativen',
+    'url' => '/admin/workshops/index',
     'level' => 'main'
 ));
 echo $this->Html->createMenuEntry(array(
-    'name' => 'Kenntnisse',
-    'url' => '/admin/skills/index',
+    'name' => 'Reparaturwissen',
+    'url' => '/admin/knowledges/index',
     'level' => 'main'
 ));
 echo $this->Html->createMenuEntry(array(
-    'name' => 'Marken',
-    'url' => '/admin/brands/index?sort=status&direction=asc',
+    'name' => 'Seiten',
+    'url' => '/admin/pages/index',
     'level' => 'main'
 ));
 echo $this->Html->createMenuEntry(array(
-    'name' => 'Laufzettel',
-    'url' => '/admin/info-sheets/index',
+    'name' => 'User',
+    'url' => '/admin/users/index',
+    'level' => 'main'
+));
+echo $this->Html->createMenuEntry(array(
+    'name' => 'Termine',
+    'url' => '/admin/events/index?val-status=1&key-status=Events.status',
     'level' => 'main'
 ));
+
 ?>
\ No newline at end of file
diff --git a/plugins/Admin/templates/element/list.php b/plugins/Admin/templates/element/list.php
index 856880850..efb147697 100644
--- a/plugins/Admin/templates/element/list.php
+++ b/plugins/Admin/templates/element/list.php
@@ -338,6 +338,7 @@
                                 $showMethodCall = null;
                             }
                             break;
+                        case 'urlKnowledgeDetail':
                         case 'urlUserProfile':
                             $showMethodCall = $this->Html->$showMethodUrl($object['uid']);
                             break;
diff --git a/plugins/Admin/webroot/css/admin.css b/plugins/Admin/webroot/css/admin.css
index 19ff04898..bda280111 100644
--- a/plugins/Admin/webroot/css/admin.css
+++ b/plugins/Admin/webroot/css/admin.css
@@ -1,4 +1,4 @@
-#/* START admin layout änderungen */
+/* START admin layout änderungen */
 body, html {
     font-family: 'Open Sans', arial, helvetica;
     font-size: 13px;
@@ -26,7 +26,7 @@ h1 {
     padding: 1%;
     width: 98%;
     display: block;
-    margin-top: 90px;
+    margin-top: 110px;
 }
 
 a {
@@ -43,6 +43,7 @@ a {
     display: block;
     margin: 0px auto;
     z-index: 7000;
+    border-bottom: 1px solid #dfdfdf;
 }
 
 #nav {
@@ -73,7 +74,9 @@ div.admin #admin-list-form div.left {
     margin-top: -3px;
     margin-right: 10px;
 }
-
+div.admin div.list {
+    margin-top: -10px;
+}
 div.admin div.list a.active {
     color: #4C4C4C;
 }
diff --git a/plugins/Admin/webroot/css/admin.menu.css b/plugins/Admin/webroot/css/admin.menu.css
index ed32ec4c4..85933f34a 100644
--- a/plugins/Admin/webroot/css/admin.menu.css
+++ b/plugins/Admin/webroot/css/admin.menu.css
@@ -26,8 +26,6 @@
 #navadmin li a {
     color: #333;
     display: block;
-    background: #4D8EA2;
-    border-radius: 5px;
 }
 
 #navadmin span:after {
@@ -48,7 +46,7 @@
     width: 100%;
     padding: 0%;
     margin: 0px auto;
-    height: 40px;
+    height: 45px;
     float: left;
 }
 
@@ -57,28 +55,35 @@
     margin-top: 2px;
     display: block;
     float: left;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    height: 45px;
+    background-color: #efefef;
+    border-radius: 5px;
 }
 
 #navadmin>ul>li>a {
     padding: 10px 5px;
     display: block;
-    width: 77px;
-    font-size: 15px;
+    width: 74px;
+    font-size: 14px;
     text-align: center;
     font-weight: normal;
-    color: #fff;
+    word-break: break-all;
 }
 #navadmin>ul>li>a.two-lines {
     padding-top: 9px;
     padding-bottom:7px;
 }
 
-#navadmin>ul>li:not ( :last-child ) > a {
+#navadmin>ul>li:not(:last-child) > a {
     border-right: 1px solid transparent;
 }
 
-#navadmin>ul>li:hover>a, #navadmin>ul:not ( :hover ) > li>a.active {
-    background-color: #ccc ! important;
+#navadmin > ul > li:hover > a,
+#navadmin > ul:not(:hover) > li a.active {
+    text-decoration: underline;
 }
 
 /* second level */
diff --git a/src/Controller/AppController.php b/src/Controller/AppController.php
index 9a44b7ca8..305a87512 100644
--- a/src/Controller/AppController.php
+++ b/src/Controller/AppController.php
@@ -292,7 +292,7 @@ protected function stripTagsFromFields($entity, $modelName)
             } else if ($field == 'text') {
                 // ckeditor feld heißt normalerweise 'text'
                 $allowedTags = ALLOWED_TAGS_CKEDITOR_USER;
-                if ($this->AppAuth->isAdmin() && in_array($modelName, ['Post', 'Page'])) {
+                if ($this->AppAuth->isAdmin() && in_array($modelName, ['Post', 'Page', 'Knowledge'])) {
                     $allowedTags =  ALLOWED_TAGS_CKEDITOR_ADMIN;
                 }
                 $entity->$field = strip_tags($data, $allowedTags);
diff --git a/src/Controller/KnowledgesController.php b/src/Controller/KnowledgesController.php
new file mode 100644
index 000000000..b88b38d2c
--- /dev/null
+++ b/src/Controller/KnowledgesController.php
@@ -0,0 +1,81 @@
+<?php
+
+namespace App\Controller;
+
+use App\Controller\Component\StringComponent;
+use Cake\Core\Configure;
+use Cake\Event\EventInterface;
+use Cake\Utility\Hash;
+
+class KnowledgesController extends AppController
+{
+
+     public function __construct($request = null, $response = null)
+    {
+        parent::__construct($request, $response);
+        $this->Knowledge = $this->getTableLocator()->get('Knowledges');
+    }
+
+    public function beforeFilter(EventInterface $event)
+    {
+        parent::beforeFilter($event);
+        $this->AppAuth->allow([
+            'all',
+        ]);
+    }
+
+    public function all()
+    {
+
+        $knowledges = $this->Knowledge->find('all', [
+            'conditions' => [
+                'Knowledges.status' => APP_ON
+            ],
+            'contain' => [
+                'Skills',
+                'Categories',
+            ],
+            'order' => [
+                'Knowledges.title' => 'ASC',
+            ],
+        ])->toArray();
+
+        foreach($knowledges as &$knowledge) {
+            $categoryNames = Hash::extract($knowledge, 'categories.{n}.name');
+            $itemSkillClasses = [];
+            foreach($categoryNames as $categoryName) {
+                $itemSkillClasses[] = StringComponent::slugify($categoryName);
+            }
+            $skills = Hash::extract($knowledge, 'skills.{n}.id');
+            $itemSkillClasses = array_merge($itemSkillClasses, $skills);
+            $knowledge->itemSkillClasses = $itemSkillClasses;
+        }
+        $this->set('knowledges', $knowledges);
+
+        $skillsForDropdown = [];
+
+        $categories = Hash::extract($knowledges, '{n}.categories.{n}');
+        foreach($categories as $category) {
+            $categorySlug = StringComponent::slugify($category['name']);
+            if (!isset($skillsForDropdown[$categorySlug])) {
+                $skillsForDropdown[$categorySlug] = $category['name'];
+            }
+        }
+
+        $skills = Hash::extract($knowledges, '{n}.skills.{n}');
+        foreach($skills as $skill) {
+            if (!isset($skillsForDropdown[$skill['id']])) {
+                $skillsForDropdown[$skill['id']] = $skill['name'];
+            }
+        }
+        asort($skillsForDropdown);
+        $this->set('skillsForDropdown', $skillsForDropdown);
+
+        $metaTags = [
+            'title' => 'Reparaturwissen'
+        ];
+        $this->set('metaTags', $metaTags);
+
+    }
+
+}
diff --git a/src/Controller/UsersController.php b/src/Controller/UsersController.php
index b49b81035..35788cbd0 100644
--- a/src/Controller/UsersController.php
+++ b/src/Controller/UsersController.php
@@ -141,17 +141,7 @@ public function all()
         }
 
         $this->Skill = $this->getTableLocator()->get('Skills');
-        $skillsForDropdown = $this->Skill->getForDropdown(false);
-
-        $this->Category = $this->getTableLocator()->get('Categories');
-        $categoriesForDropdown = $this->Category->getMainCategoriesForFrontend();
-        $preparedCategoriesForDropdown = [];
-        foreach($categoriesForDropdown as $c) {
-            $slugifiedCategoryName = StringComponent::slugify($c->name);
-            $preparedCategoriesForDropdown[$slugifiedCategoryName] = $c->name;
-        }
-        $skillsForDropdown = $preparedCategoriesForDropdown + $skillsForDropdown;
-        asort($skillsForDropdown);
+        $skillsForDropdown = $this->Skill->getForDropdownIncludingCategories(false);
         $this->set('skillsForDropdown', $skillsForDropdown);
 
         $metaTags = [
@@ -325,7 +315,7 @@ private function _profil($user, $isMyProfile, $isEditMode)
             $this->request = $this->request->withData('Users.private', $private);
 
             $this->Skill = $this->getTableLocator()->get('Skills');
-            $this->request = $this->Skill->addSkills($this->request, $this->AppAuth);
+            $this->request = $this->Skill->addSkills($this->request, $this->AppAuth, 'Users');
 
             $user = $this->User->patchEntity($user, $this->request->getData(), ['validate' => 'UserEdit' . ($this->AppAuth->isAdmin() ? 'Admin' : 'User')]);
             if (!$user->hasErrors()) {
@@ -595,7 +585,7 @@ public function register($userGroup=GROUPS_REPAIRHELPER)
             }
 
             $this->Skill = $this->getTableLocator()->get('Skills');
-            $this->request = $this->Skill->addSkills($this->request, $this->AppAuth);
+            $this->request = $this->Skill->addSkills($this->request, $this->AppAuth, 'Users');
 
             if ($this->request->getData('Users.i_want_to_receive_the_newsletter')) {
                 $this->loadComponent('CptNewsletter');
diff --git a/src/Model/Table/KnowledgesTable.php b/src/Model/Table/KnowledgesTable.php
new file mode 100644
index 000000000..7a51e10d9
--- /dev/null
+++ b/src/Model/Table/KnowledgesTable.php
@@ -0,0 +1,40 @@
+<?php
+namespace App\Model\Table;
+
+use Cake\Validation\Validator;
+
+class KnowledgesTable extends AppTable
+{
+
+    public $name_de = 'Reparaturwissens-Beitrag';
+
+    public function initialize(array $config): void
+    {
+        parent::initialize($config);
+        $this->belongsTo('Blogs');
+        $this->belongsToMany('Categories', [
+            'joinTable' => 'knowledges_categories',
+            'foreignKey' => 'knowledge_uid',
+            'targetForeignKey' => 'category_id',
+            'dependent' => true,
+        ]);
+        $this->belongsToMany('Skills', [
+            'joinTable' => 'knowledges_skills',
+            'foreignKey' => 'knowledge_uid',
+            'targetForeignKey' => 'skill_id',
+            'sort' => [
+                'Skills.name' => 'ASC'
+            ],
+            'dependent' => true,
+        ]);
+    }
+
+    public function validationAdmin(Validator $validator)
+    {
+        $validator->notEmptyString('title', 'Bitte gib einen Titel an.');
+        $validator->minLength('title', 2, 'Bitte gib einen gültigen Titel an.');
+        return $validator;
+    }
+
+}
+?>
\ No newline at end of file
diff --git a/src/Model/Table/SkillsTable.php b/src/Model/Table/SkillsTable.php
index 7d5d7adce..40ef1d86a 100644
--- a/src/Model/Table/SkillsTable.php
+++ b/src/Model/Table/SkillsTable.php
@@ -1,8 +1,10 @@
 <?php
 namespace App\Model\Table;
 
+use App\Controller\Component\StringComponent;
 use Cake\ORM\Table;
 use Cake\Validation\Validator;
+use Cake\Datasource\FactoryLocator;
 
 class SkillsTable extends Table
 {
@@ -34,10 +36,10 @@ public function validationDefault(Validator $validator): \Cake\Validation\Valida
         return $validator;
     }
 
-    public function addSkills($request, $appAuth)
+    public function addSkills($request, $appAuth, $entity)
     {
 
-        $skills = $request->getData('Users.skills._ids');
+        $skills = $request->getData($entity . '.skills._ids');
         if (empty($skills)) {
             return $request;
         }
@@ -54,7 +56,7 @@ public function addSkills($request, $appAuth)
                 ]);
             }
         }
-        $request = $request->withData('Users.skills._ids', $skills);
+        $request = $request->withData($entity . '.skills._ids', $skills);
 
         $addedSkillIds = [];
         if (!empty($skillsToAdd)) {
@@ -62,17 +64,29 @@ public function addSkills($request, $appAuth)
             foreach($addedSkills as $addedSkill) {
                 $addedSkillIds[] = $addedSkill->id;
             }
-            $request = $request->withData('Users.skills._ids', array_merge($skills, $addedSkillIds));
+            $request = $request->withData($entity . '.skills._ids', array_merge($skills, $addedSkillIds));
         }
 
         return $request;
 
     }
 
-    /**
-     * @return array
-     */
-    public function getForDropdown($includeOffline)
+    public function getForDropdownIncludingCategories($includeOffline): array
+    {
+        $skillsForDropdown = $this->getForDropdown(false);
+        $this->Category = FactoryLocator::get('Table')->get('Categories');
+        $categoriesForDropdown = $this->Category->getMainCategoriesForFrontend();
+        $preparedCategoriesForDropdown = [];
+        foreach($categoriesForDropdown as $c) {
+            $slugifiedCategoryName = StringComponent::slugify($c->name);
+            $preparedCategoriesForDropdown[$slugifiedCategoryName] = $c->name;
+        }
+        $skillsForDropdown = $preparedCategoriesForDropdown + $skillsForDropdown;
+        asort($skillsForDropdown);
+        return $skillsForDropdown;
+    }
+
+    public function getForDropdown($includeOffline): array
     {
 
         $conditions = [
diff --git a/src/View/Helper/MyHtmlHelper.php b/src/View/Helper/MyHtmlHelper.php
index 055c32878..8fb97240c 100644
--- a/src/View/Helper/MyHtmlHelper.php
+++ b/src/View/Helper/MyHtmlHelper.php
@@ -473,6 +473,18 @@ function urlPostEdit($uid) {
     function urlPostNew($type='') {
         return '/admin/posts/insert/'.$type;
     }
+    function urlKnowledgeNew() {
+        return '/admin/knowledges/insert';
+    }
+    function urlKnowledgeEdit($uid) {
+        return '/admin/knowledges/edit/'.$uid;
+    }
+    function urlKnowledgeDetail($uid) {
+        return $this->urlKnowledges() . '/#' . $uid;
+    }
+    function urlKnowledges() {
+        return '/reparaturwissen';
+    }
     public function getPostTypesWithPreview() {
         return [
             'neuigkeiten',
diff --git a/templates/Knowledges/all.php b/templates/Knowledges/all.php
new file mode 100644
index 000000000..f0ab4ff85
--- /dev/null
+++ b/templates/Knowledges/all.php
@@ -0,0 +1,83 @@
+<?php
+    use App\Controller\Component\StringComponent;
+
+echo $this->element('highlightNavi', ['main' => 'Reparaturwissen']);
+    $this->element('addScript', ['script' =>
+        JS_NAMESPACE.".Helper.initBoxToggle();".
+        JS_NAMESPACE.".Helper.initSkillFilterForKnowledges();".
+        JS_NAMESPACE.".Helper.bindKnowledgeFilterButtons();
+    "]);
+?>
+
+<h1><?php echo $metaTags['title']; ?></h1>
+
+<?php
+    echo '<div class="skills-wrapper">';
+        echo '<label>Suche nach bestimmtem Schlagwort</label>';
+        echo $this->Form->control('skills', [
+            'type' => 'select',
+            'label' => false,
+            'empty' => 'Alle anzeigen',
+            'options' => $skillsForDropdown,
+        ]);
+    echo '</div>';
+?>
+<div class="sc"></div>
+
+<?php
+
+foreach($knowledges as $knowledge) {
+
+    echo '<div class="knowledge-row '. join(' ', $knowledge->itemSkillClasses) .'">';
+
+        echo '<div id="' . $knowledge->uid . '" href="#collapse' . $knowledge->uid . '" class="box-toggle' . $knowledge->uid . ' box-toggle knowledge-item">';
+
+            echo $knowledge->title;
+
+            if ($appAuth->isAdmin()) {
+                echo $this->Html->link(
+                    '<i class="far fa-edit fa-border"></i>',
+                    $this->Html->urlKnowledgeEdit($knowledge->uid),
+                    [
+                        'class' => 'knowledge-edit-icon',
+                        'escape' => false,
+                    ]
+                );
+            }
+
+        echo '</div>';
+
+        echo '<div id="collapse' . $knowledge->uid . '" class="collapse">';
+
+            echo '<div class="text-wrapper">' . $knowledge->text . '</div>';
+
+            if(!empty($knowledge->categories)) {
+                echo '<div id="skill_icons">';
+                    foreach($knowledge->categories as $category) {
+                        echo '<a href="javascript:void(0);" data-val="'.h(StringComponent::slugify($category->name)).'" title="Filtern nach '.h($category->name).'" class="skill_icon small '.h($category->icon).'"></a>';
+                    }
+                echo '</div>';
+                echo '<div class="sc"></div>';
+            }
+
+            if (!empty($knowledge->skills)) {
+                foreach($knowledge->skills as $skill) {
+                    echo '<a href="javascript:void(0);" data-val="'.$skill->id.'" title="Filtern nach '.h($skill->name).'" class="button">'.h($skill->name).'</a>';
+                }
+                echo '<div class="sc"></div>';
+            }
+            echo $this->Html->link(
+                'Permalink',
+                $this->Html->urlKnowledgeDetail($knowledge->uid),
+                [
+                    'class' => 'knowledge-permalink',
+                    'escape' => false,
+                ]
+            );
+        echo '</div>';
+
+    echo '</div>';
+
+}
+
+?>
\ No newline at end of file
diff --git a/templates/Users/all.php b/templates/Users/all.php
index 8bf4fe1ec..bfb45aa9b 100644
--- a/templates/Users/all.php
+++ b/templates/Users/all.php
@@ -3,7 +3,7 @@
 
     echo $this->element('highlightNavi', ['main' => 'Aktive']);
     $this->element('addScript', ['script' => "
-        MappedRepairEvents.Helper.initSkillFilter();
+        MappedRepairEvents.Helper.initSkillFilterForUsers();
     "]);
 ?>
 
diff --git a/templates/element/highlightNavi.php b/templates/element/highlightNavi.php
index 252db89bc..7ed1297e7 100644
--- a/templates/element/highlightNavi.php
+++ b/templates/element/highlightNavi.php
@@ -2,7 +2,7 @@
 
 if (isset($main)) {
     $this->element('addScript', ['script' => "
-        var activeElement = $('#nav ul li a').filter(function() {
+        var activeElement = $('#nav ul li a, #navadmin ul li a').filter(function() {
             return $(this).text().toLowerCase() == '" . $main . "'.toLowerCase();
         });
         activeElement.addClass('active');
diff --git a/templates/element/widget.php b/templates/element/widget.php
index 1046926be..9d7a9404e 100644
--- a/templates/element/widget.php
+++ b/templates/element/widget.php
@@ -1,6 +1,6 @@
 <?php
     $this->element('addScript', ['script' =>
-        JS_NAMESPACE.".Helper.initWidgetDocs();
+        JS_NAMESPACE.".Helper.initBoxToggle();
     "]);
 ?>
 
diff --git a/templates/element/widgetDocs/event.php b/templates/element/widgetDocs/event.php
index d85b3710c..c78e73a61 100644
--- a/templates/element/widgetDocs/event.php
+++ b/templates/element/widgetDocs/event.php
@@ -2,12 +2,10 @@
 use Cake\Core\Configure;
 ?>
 
-<div href="#collapse1" class="nav-toggle1">
-
-<?php echo __('Widgetpage: Eventsbox Integration'); ?>
+<div id="1" href="#collapse1" class="box-toggle box-toggle1">
+    <?php echo __('Widgetpage: Eventsbox Integration'); ?>
 </div>
-
-<div id="collapse1" style="display:none">
+<div id="collapse1" class="collapse">
     Kopiere folgenden Code, um den nächsten Reparaturtermin deiner <?php echo Configure::read('AppConfig.initiativeNameSingular'); ?> auf deiner eigenen Webseite anzuzeigen
     <br />
 
diff --git a/templates/element/widgetDocs/map.php b/templates/element/widgetDocs/map.php
index 17ef0dace..7d429d37a 100644
--- a/templates/element/widgetDocs/map.php
+++ b/templates/element/widgetDocs/map.php
@@ -2,10 +2,10 @@
 use Cake\Core\Configure;
 ?>
 
-<div href="#collapse2" class="nav-toggle2">
+<div id="2" href="#collapse2" class="box-toggle box-toggle2">
     <?php echo __('Widgetpage: Map Integration'); ?>
 </div>
-<div id="collapse2" style="display:none">
+<div id="collapse2" class="collapse">
     <h2>Schnell-Einbindung</h2>
     Kopiere den folgenden Code, um die komplette Landkarte aller <?php echo Configure::read('AppConfig.initiativeNamePlural'); ?> auf deiner eigenen Webseite anzuzeigen:
     <br />
diff --git a/templates/element/widgetDocs/statistic.php b/templates/element/widgetDocs/statistic.php
index 29e775d6e..9a2e0c949 100644
--- a/templates/element/widgetDocs/statistic.php
+++ b/templates/element/widgetDocs/statistic.php
@@ -2,10 +2,10 @@
 use Cake\Core\Configure;
 ?>
 
-<div href="#collapse3" class="nav-toggle3">
+<div id="3" href="#collapse3" class="box-toggle box-toggle3">
     Integration Statistik
 </div>
-<div id="collapse3" style="display:none">
+<div id="collapse3" class="collapse">
     Kopiere den folgenden Code, um die die Statistik aller <?php echo Configure::read('AppConfig.initiativeNamePlural'); ?> auf deiner eigenen Webseite anzuzeigen:
     <br />
     <br />
diff --git a/webroot/css/frontend.css b/webroot/css/frontend.css
index 1608dcf29..e16bc24fa 100644
--- a/webroot/css/frontend.css
+++ b/webroot/css/frontend.css
@@ -716,7 +716,8 @@ body.users.profil .select2-search__field {
 }
 body.users .profile .categories-checkbox-wrapper .input label,
 #eventEditForm .categories-checkbox-wrapper .input label,
-#workshopEditForm .categories-checkbox-wrapper .input label {
+#workshopEditForm .categories-checkbox-wrapper .input label,
+#knowledgeEditForm .categories-checkbox-wrapper .input label {
   width: 212px;
 }
 #infoSheetEditForm .form-fields-checkbox-wrapper .input.select,
@@ -853,6 +854,7 @@ body.users .profile label.private input,
 body.users .profile .categories-checkbox-wrapper input,
 #infoSheetEditForm .form-fields-checkbox-wrapper input,
 #eventEditForm .categories-checkbox-wrapper input,
+#knowledgeEditForm .categories-checkbox-wrapper input,
 body.users .profile .groups-checkbox-wrapper input {
   float: left;
   margin: 0;
@@ -1321,37 +1323,45 @@ iframe.eiwsd {
     width: 99%;
     margin: 0px;
 }
-#wswidget .nav-toggle1:hover,
-#wswidget .nav-toggle2:hover,
-#wswidget .nav-toggle3:hover {
+.box-toggle:hover {
     background-color: #4D8EA2 !important;
+    color: #fff;
 }
-#wswidget .nav-toggle1,
-#wswidget .nav-toggle2,
-#wswidget .nav-toggle3 {
+.box-toggle {
     cursor: pointer;
     padding: .5%;
     color: black;
     font-weight: bold;
     line-height: 33px;
     background-color: #f2f2f2;
-    margin: 10px 0px;
+    margin-top: 10px;
     text-indent: 5px;
+    border-radius: 5px;
 }
-#wswidget .nav-toggle1.active,
-#wswidget .nav-toggle2.active,
-#wswidget .nav-toggle3.active {
+.box-toggle.active {
     background-color: #4D8EA2 !important;
-    text-indent: 15px;
+    color: #fff;
+    border-bottom-right-radius: 0;
+    border-bottom-left-radius: 0;
 }
-#collapse1,
-#collapse2,
-#collapse3 {
-    padding: 0px 20px;
+.box-toggle:before {
+    content: '▶';
+    font-size: 11px;
+    margin-right: 4px;
 }
-div[id*="collapse"] a:link,
-div[id*="collapse"] a:visited {
-    text-decoration: underline
+.box-toggle.active:before {
+    content: '▼';
+    font-size: 11px;
+    margin-right: 4px;
+}
+.collapse {
+    display: none;
+    padding: 10px;
+    margin-bottom: 20px;
+    border: 2px solid #4D8EA2;
+    border-radius: 5px;
+    border-top-right-radius: 0;
+    border-top-left-radius: 0;
 }
 .inlinecode {
     margin: 10px 0px;
@@ -1533,17 +1543,6 @@ div.ckeditor-text,
     margin-left: 17px;
     margin-bottom: 10px;
 }
-/* Iframes for Titan Pads
-/* .h_iframe iframe {
-    position:absolute;
-    top:0;
-    left:0;
-    width:100%;
-    height:875px;
-    display:block
-}
-*/
-
 .video-container {
     position: relative;
     padding-bottom: 56.25%;
@@ -2080,7 +2079,8 @@ body.users .profile .groups-checkbox-wrapper {
 }
 body.users .profile .categories-checkbox-wrapper b,
 #eventEditForm .categories-checkbox-wrapper b,
-#workshopEditForm .categories-checkbox-wrapper b {
+#workshopEditForm .categories-checkbox-wrapper b,
+#knowledgeEditForm .categories-checkbox-wrapper b {
   margin-bottom: 15px;
   float: left;
   width: 237px;
@@ -2654,12 +2654,32 @@ body.workshops.detail .skill-icons .skill_icon {
     cursor: pointer;
 }
 body.workshops.detail .skill_icon.small,
-body.users.publicProfile .skill_icon.small {
+body.users.publicProfile .skill_icon.small,
+body.knowledges.all .skill_icon.small {
     width: 50px;
     height: 50px;
     background-size: 50px 50px;
     margin-top: 5px;
 }
+body.knowledges.all .collapse a.selected {
+    opacity: .7;
+}
+body.knowledges.all .knowledge-row {
+    position: relative;
+}
+body.knowledges.all .knowledge-edit-icon {
+    position: absolute;
+    right: 10px;
+}
+body.knowledges.all .knowledge-permalink {
+    position: absolute;
+    bottom: 10px;
+    right: 10px;
+}
+body.knowledges.all .knowledge-edit-icon i {
+    padding-left: 1px;
+    padding-right: 4px;
+}
 .lstCat.chosenCat {
     background-color: #ddd;
 }
@@ -2825,76 +2845,76 @@ body.workshops.detail article.full {
     margin: 0 auto;
     cursor: pointer
 }
-.desktop-pcs {
+.desktop-pcs:not(.knowledge-row) {
     background-image: url(/img/icons-skills/desktop-pcs.png);
     height: 100px;
 }
-.elektro {
+.elektro:not(.knowledge-row) {
     background-image: url(/img/icons-skills/elektro.png);
     width: 100px;
     height: 100px;
 }
-.fahrrad {
+.fahrrad:not(.knowledge-row) {
     background-image: url(/img/icons-skills/fahrrad.png);
     width: 100px;
     height: 100px;
 }
-.handy-smartphone-tablet {
+.handy-smartphone-tablet:not(.knowledge-row) {
     background-image: url(/img/icons-skills/handy-smartphone-tablet.png);
     width: 100px;
     height: 100px;
 }
-.haushalt {
+.haushalt:not(.knowledge-row) {
     background-image: url(/img/icons-skills/haushalt.png);
     width: 100px;
     height: 100px;
 }
-.holz {
+.holz:not(.knowledge-row) {
     background-image: url(/img/icons-skills/holz.png);
     width: 100px;
     height: 100px;
 }
-.mechanik {
+.mechanik:not(.knowledge-row) {
     background-image: url(/img/icons-skills/mechanik.png);
     width: 100px;
     height: 100px;
 }
-.metall {
+.metall:not(.knowledge-row) {
     background-image: url(/img/icons-skills/metall.png);
     width: 100px;
     height: 100px;
 }
-.textilien {
+.textilien:not(.knowledge-row) {
     background-image: url(/img/icons-skills/textilien.png);
     width: 100px;
     height: 100px;
 }
-.unterhaltungselektronik {
+.unterhaltungselektronik:not(.knowledge-row) {
     background-image: url(/img/icons-skills/unterhaltungselektronik.png);
     width: 100px;
     height: 100px;
 }
-.upcycling-basteln {
+.upcycling-basteln:not(.knowledge-row) {
     background-image: url(/img/icons-skills/upcycling-basteln.png);
     width: 100px;
     height: 100px;
 }
-.schmuck {
+.schmuck:not(.knowledge-row) {
     background-image: url(/img/icons-skills/schmuck.png);
     width: 100px;
     height: 100px;
 }
-.leder {
+.leder:not(.knowledge-row) {
     background-image: url(/img/icons-skills/leder.png);
     width: 100px;
     height: 100px;
 }
-.drei-d-reparatur {
+.drei-d-reparatur:not(.knowledge-row) {
     background-image: url(/img/icons-skills/drei-d-reparatur.png);
     width: 100px;
     height: 100px;
 }
-.emptyskill {
+.emptyskill:not(.knowledge-row) {
     background-image: url(/img/icons-skills/empty.png);
     width: 100px;
     height: 100px;
@@ -3062,12 +3082,17 @@ body.events.all .lstCatNew.skill_icon {
     height: 42px;
     background-size: 42px 42px;
 }
-body.users.publicProfile #skill_icons {
+body.users.publicProfile #skill_icons,
+body.knowledges.all #skill_icons {
   position: static;
   margin-top: 0;
   float: left;
   margin-bottom: 15px;
 }
+body.knowledges.all #skill_icons {
+    margin-top: 10px;
+    width: 100%;
+}
 body.users.publicProfile .workshop-link-wrapper {
   float: left;
   margin-bottom: 15px;
@@ -3216,7 +3241,8 @@ body.users.publicProfile .about-me-wrapper .about-me-content {
     width: 100%;
     line-height: 19px;
 }
-body.users.publicProfile .about-me-wrapper .button {
+body.users.publicProfile .about-me-wrapper .button,
+body.knowledges.all .button {
     margin-right: 5px;
     margin-bottom: 5px;
     float: left;
@@ -3254,24 +3280,28 @@ body.skills.all h1 {
 body.skills.all .dotted-line-full-width {
     margin-bottom: 15px;
 }
+body.knowledges.all h1,
 body.users.all h1 {
     float: left;
     width: 845px;
     line-height: 45px;
 }
-body.users.all .skills-wrapper {
+body.users.all .skills-wrapper,
+body.knowledges.all .skills-wrapper {
     float: right;
     width: 265px;
     margin-top: 10px;
     margin-bottom: 10px;
 }
-body.users.all .skills-wrapper label {
+body.users.all .skills-wrapper label,
+body.knowledges.all .skills-wrapper label {
     float: right;
     margin-right: 5px;
     margin-top: 5px;
     margin-bottom: 5px;
 }
-body.users.all .skills-wrapper .input.select {
+body.users.all .skills-wrapper .input.select,
+body.knowledges.all .skills-wrapper .input.select {
     float: right;
 }
 body.users.all h1 a,
diff --git a/webroot/css/mobile-frontend.css b/webroot/css/mobile-frontend.css
index 2ef6f25e8..02374879b 100644
--- a/webroot/css/mobile-frontend.css
+++ b/webroot/css/mobile-frontend.css
@@ -70,7 +70,8 @@
        width: 63%;
        margin-left: 3%;
     }
-    body.users.all .skills-wrapper {
+    body.users.all .skills-wrapper,
+    body.knowledges.all .skills-wrapper {
         margin-top: -20px;
     }
     body.users.all h1 {
diff --git a/webroot/js/helper.js b/webroot/js/helper.js
index 794807bd8..4e3f1a963 100644
--- a/webroot/js/helper.js
+++ b/webroot/js/helper.js
@@ -131,7 +131,46 @@ MappedRepairEvents.Helper = {
         $('#header #login-box').css('right', newRight + 'px');
     },
 
-    initSkillFilter : function() {
+    initSkillFilterForKnowledges : function() {
+        $('select#skills').on('change', function() {
+            MappedRepairEvents.Helper.applyFilterForKnowledge($(this).val());
+        });
+    },
+
+    applyFilterForKnowledge : function(value) {
+
+        var allButtons = $('.collapse').find('a.skill_icon, a.button');
+        allButtons.each(function() {
+            $(this).removeClass('selected');
+        });
+        $('.knowledge-row').hide();
+
+        if (value != '') {
+            $('.knowledge-row.' + value).show();
+            allButtons.each(function() {
+                if ($(this).data('val') == value) {
+                    $(this).addClass('selected');
+                }
+            });
+        } else {
+            $('.knowledge-row').show();
+        }
+    },
+
+    bindKnowledgeFilterButtons: function() {
+        var allButtons = $('.collapse').find('a.skill_icon, a.button');
+        allButtons.on('click', function() {
+            var value;
+            if ($(this).hasClass('selected')) {
+                value = '';
+            } else {
+                value = $(this).data('val');
+            }
+            $('select#skills').val(value).trigger('change');
+        });
+    },
+
+    initSkillFilterForUsers : function() {
         $('select#skills').on('change', function() {
             var url = '/aktive';
             if (parseInt($(this).val()) == $(this).val()) {
@@ -193,25 +232,29 @@ MappedRepairEvents.Helper = {
         return parseFloat(string);
     },
 
-    initWidgetDocs : function() {
-        $('.nav-toggle1,.nav-toggle2,.nav-toggle3').click(function() {
-            var collapse_content_selector = $(this).attr('href');
-            $(this).addClass(' active');
-            var toggle_switch = $(this);
-            $(collapse_content_selector).toggle(function() {
+    initBoxToggle : function() {
+        $('.box-toggle').on('click', function() {
+            var collapseContentSelector = $(this).attr('href');
+            if ($(this).hasClass('active')) {
+                $(this).removeClass('active');
+            } else {
+                $(this).addClass('active');
+            }
+            $(collapseContentSelector).fadeToggle(100, function() {
                 if ($(this).css('display') == 'none') {
-                    $('.nav-toggle' + myhash).removeClass(' active');
-                    $('.nav-toggle1,.nav-toggle2,.nav-toggle3').removeClass(' active');
+                    $(this).removeClass('active');
                 } else {
-                    $(this).addClass(' active');
+                    $(this).addClass('active');
                 }
             });
         });
+
         if (window.location.hash) {
             var myhash = window.location.hash.substring(1);
-            $('.nav-toggle' + myhash).trigger('click');
-            $('.nav-toggle' + myhash).addClass(' active');
+            $('.box-toggle' + myhash).trigger('click');
         }
+
+
     },
 
     initCookieBanner : function() {