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!
Adding the library-libby nexus. Most libraries have an eBook collection connected through Libby. I’ve got a Kindle and zero books bought from Amazon. It’s great.
Protip, if you went to any form of formal education (college) then you probably have alumni library account access. My Libby has three library cards logged in. I never wait for a book.