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!
In terms of fully free, obligatory mention:
Your library may offer more than books alone, depending on how well supported they are. Borrow music, movies, sometimes even video games. For music and movies they may also offer these to borrow digitally as well via online services they coordinate with.
The library of things is also something many public libraries have now. Not just media, but tools, power tools, cooking pans and equipment, pod casting equipment. Definitely worth a look.
You can borrow fishing rods at ours.
Mine has trekking poles! (Colorado)
Our library does audio books, 3d printer, sound recording (like a small studio), and passes to provincial parks. Some can offer a lot!
I moved to a new town in 2022 and I STILL haven’t been to the local library. I need to get on that. I went to libraries so much as a child and in my teens.