I've found the DefogTech channel https://www.youtube.com/channel/UCiz26UeGvcTy4_M3Zhgk7FQ quite good at explaining some more advanced concepts. It's very java centric though.

I've had the exact same idea. I would love to not be constrained to having to sit down infront of a screen. My dream setup would be a projector-screen on the wall and being able to walk freely around while coding.