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!
If you need what I understand to be considered a full-on DAW, there’s Ardour, which is also FLOSS.
Never tried it! Thanks for the suggestion!