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!
I have a pro tip for mattresses! Thrown it down in your driveway, take a box knife and strip it to the bare metal springs. Boom! You now have a plant trellis. First try only took me 20 minutes.
Saw a posh resale store that took twin mattress springs, sprayed ‘em black, hung vertically and spaced 2’ apart over a standing flower bed. Now sure what the plant was but it sure looked cool.
Trying it for the first time this year on the ferns and blackberries on the side of the house. Already have a solid start!