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!
Your neighbor’s trash. It’s stunning what I find and fix, refurbish, repurpose or sell. Had a friend that used to cruise her hood on trash day, her and her husband would load the truck, sell it back to 'em on a Saturday garage sale. 12-14 hours biweekly work, ~$400 every other weekend.
My wife’s friends dumpster dive at Walmart, though I question how that’s possible. Most big box stores make that impossible. Dunno. In any case, it’s wild what these stores chunk out. If Lowe’s would let me, I’d haul home a pickup full every week.
On that note, never bring back mattresses, anything upholstered, or anything else that has a lot of unsealed cracks/gaps. Way too big a risk of introducing bed bugs into your home.
So many people just dump seemingly nice mattresses/sofas etc. out on the curb. They’re obviously not going to label these things as infested with bed bugs for a scavenger’s benefit and alert the whole neighborhood to their shame. Do not take these items. It is not worth the potential nightmare you’re setting yourself up for.
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!