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!
very underrated piece of software! its been a total game changer in how i have my computers set up.
also great for some apps too. things like keepass or newsboat (terminal RSS reader) or anything that stores its data in a single file or folder. its really great not having to rely on a connection to a server