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!
Ive definitely never, ever run into that. But I’m sure it happens.
Edit: I guess ive seen places that charged some nominal fee for the cup but it’s so rare