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!
Not free as in freedom, but gratis. Also only works for people who are on Discord - FreeStuff Bot will notify you every time a game on one of the popular PC platforms is available for free.