How do I download and save a YouTube video to my Android phone?

Hello everybody!
I am having a problem need people help me. I am a movie lover. I want to download my favorite movies and videos to my phone for offline viewing. On Youtube and other sites limit the download so I do not know how. I am looking for an application that will help me to download videos from video sites to my phone. I am using a Samsung Galaxy J5 phone. Help me!
thanks everyone!

Hi
First of all you have to write in italian.
Second pay attention to the argument you are speaking about. It's not allowed what you want to do

Closed

Inviato dal mio Redmi 4 utilizzando Tapatalk