Would like to ask, is there any API that lets us get url of the movie in tmdb website? So I could redirect users to the website to view more information about the movie, or something like that.
This is quite simple: You can build TMDB movie URL by concatenating https://www.themoviedb.org/movie/ + movie id.
TMDB has user friendly urls (with movie name), but URLs containg only movie id also work (and redirect to the same page).
For example, https://www.themoviedb.org/movie/399579 will redirect to https://www.themoviedb.org/movie/399579-alita-battle-angel