for coding, i think https://www.youtube.com/c/DigiDigger - DigiDigger - has some good videos on how certain games implement their "thing" - like how portals are implemented in the game Portal.
Unfortunately, the videos are for entertainment mostly, and a bit lacking on the details, so only good enough to get the idea across.
Ben Eater (low-level digital hardware stuff, builds a computer from gates basically)
Thought Emporium (Molecular Bio)
The Coding Train (Creative Coding)
Also nice to just watch random MITx & similar lectures sometimes