How To Download Any YouTube Videos on Android ?

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!

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