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Ben Eater. He’s been explaining the low level details of how computers work. Literally building a functioning computer from nothing but a cpu and a breadboard. Incredibly good explanations.
I learned more from that guy than I did from the "intro to computer engineering" class I took for my CS degree.
I started in the industry doing 6502 assembly language programming and I’m still learning a ton from him!
In the same vein, check out CuriousMarc, especially the series about restoring an Apollo Guidance Computer to working order. (They actually finish up by simulating a moon landing.)
I mean, he also built a functioning CPU on breadboards.
One of my favorite video series on youtube
And for those who have watched all Ben Eater's videos, I highly recommend James Sharman's 8 Bit CPU from scratch playlist. I'ts a bit less step-by-step-tutorial, but it covers more ground than Ben.