@nicolaas_dev said:
Search movie by ID
Hello, I have a problem and I can't find how to search for a movie by ID.
What I want is to click on a movie and send me to another page with additional data on that movie that was selected

I suggest that you read the basic instructions for using the TMDb API.
The example is also valid to fetch data from People or TV Show with the appropriate API Request adaptations.
Search & Query For Details
https://developers.themoviedb.org/3/getting-started/search-and-query-for-details
More data and information on Movie data search methods see here
get / movie / {movie_id}
https://developers.themoviedb.org/3/movies/get-movie-details