One way to learn a language is to live in a place where that language is spoken as a native language. Now we have internet and we have the opportunity to listen native speakers in our computers. How? Those native speakers are speaking in hundreds of movies, aren’t they like that?
Movies are not made to teach language, so what could be the advantage here, that means if we can understand the movie speech we can understand the spoken language.
Is it easy, it is not, obviously it is hard. You know every success is in the hard way, there is no easy way to succeed.