This is a list with some Youtube channels that I like to watch.
They aren't arranged in any particular order.
Ben Eater he has a series where he built an 8-bit computer in a breadboard. This is better than some books on computer architecture.
This Old Tony is an extremely skilled and funny machinist. He has a series where he built a kart for his son with mostly scrap parts.
SV Seeker Doug is building a GIANT boat in his backyard.
MetalJesusRocks The Metal Jesus is a long-haired rocker dude who runs a channel dedicated to Retro Gaming with a Heavy Metal soundtrack.
The Thought Emporium I'll just paste here his own description from Youtube:
When we think of science and scientists, we tend to think of people in perfect white lab coats, working in a shiny and expensive lab. Well I'm here to break that image. From biohacking and biology, to nuclear physics and nanotech, any topic is fair game. I don't just talk about concept and theory, I do the real science. Under controlled conditions, I'll use high voltage, corrosive solutions, extreme temperatures and more to create some very exciting machines and materials. Best of all, I'll show all of it can be done at home using as many off the shelf and DIY parts as possible.