Freetube is great for regular video playback but isn’t a great music player, and it’s not super stable on android for me. None of the YouTube music apps like outertune have video. Meanwhile some way to keep everything organized from my multiple music sources would be cool too.
For android, try out Metrolist, found using f-droid with IzzyOnDroid repos added. On Linux, I use FreeTube for videos/subscriptions on both Linux and android. AudioTube on Linux for music from Youtube.