I’ll start by plugging Harvard’s free courses catalog as well as Udemy
Edit: Gonna add 2 more I remembered-
Blender - I wish I had more time to learn it, but I did start the infamous “Donut Tutorial” once!
Watch Cartoons Online - Lots of good older stuff!
It’s a FOSS plex alternative… yes you will need to stock your own library Then install SonArr, RadArr, some other Arr 🏴☠️just learn Linux nub. Jk but not really