easiest way to program Android games?

xamarin my guy, good luck

android studio

Android Studio is a joke if you're looking to make games. Might want to think about a game engine. If its text based or something more like forms and what apps generally look like, maybe take a look at Flutter.

Is there any usefull YouTube channels for game development

Yo @Sazor98, try to use an engine like Unity. Those support Multi-Platforming and are easy to use once you got into it.
It's not that hard, to be honest. There are tons of tutorials out there and the game-dev-community is helpful too.

Try to react native or flutter. They are cross-flatforms.