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.
People think I’m some sort of TV repair wizard but it’s very easy to fix up dumpster TVs if you have a little patience and space. Broken TVs fall into two categories - broken screen or broken board (doesn’t turn on, error screens, flickering). Stick to more popular models and when you find a broken screen, take the board and note the model. When you find a broken board of the same model, just swap it. It usually really is that easy. You can work in the opposite direction too and collect good screens waiting for good boards, but that starts to take up a lot of space quick because you’re storing whole TVs at that point.
You will also inexplicably find a fully working 55" TV sitting at the dumpster 10% of the time.
People moving and can’t be bothered / don’t have the time for FB marketplace or similar
Americans: we so poor, every country is ripping us off!