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!
This isn’t likely to work without some whack a mole with errors though but it should be enough for someone curious enough to be able to get a working solution.
My NAS currently has a sole 10TB HDD and funds are too low to justify an additional one so I am very nervous.