run npm install create .env in src folder and fill the data

REACT_APP_MY_API_KEY = ?api_key=your_api_key REACT_APP_MOVIE_DETAILS_URL = https://api.themoviedb.org/3/movie/ REACT_APP_TOP_MOVIES_URL = https://api.themoviedb.org/3/movie/top_rated REACT_APP_SEARCH_MOVIES_URL = https://api.themoviedb.org/3/search/movie REACT_APP__TV_SHOW_DETAILS_URL = https://api.themoviedb.org/3/tv/ REACT_APP_TOP_TV_SHOWS_URL = https://api.themoviedb.org/3/tv/top_rated REACT_APP_SEARCH_TV_SHOWS_URL = https://api.themoviedb.org/3/search/tv REACT_APP_FETCH_MOVIE_DETAILS = https://api.themoviedb.org/3/movie/ REACT_APP_FETCH_TV_SHOW_DETAILS = https://api.themoviedb.org/3/tv/

then run npm start