[searchableguy]

If I may, I also suggest:

Ben Eater: electronics, networking, computer architecture, breadboards, and information theory.

Missing semester: Great introduction to computer science and basic programming skills. Good as a reference.

BPS.space: Aerospace engineering, rockets and stuff.

Andreas Kling: computer OS from scratch.

Numberphile, computerphile and so on for quick bites.

Edit: fixed typo

[apetresc]

Just a note for anyone Googling: it's Andreas Kling rather than King. (And his channel is awesome)

[dwoot]

I forgot to list Ben Eater. And thanks for sharing some others that I wasn't yet familiar with! :)