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Re:Ask HN: Self-taught webdev with lots of free time. What s... by fossuser on Wednesday August 12, 2020 @04:07PM (#24136255)
I really loved this book: https://www.amazon.com/Code-Language-Computer-Hardware-Softw...

Which goes from bits on up without shying away from circuit diagrams. It's also really well written and you can read it from start to finish.

It puts it in a historical context too which makes it fun to read.

Once you read that, they'll be fewer unknown unknowns.

Re:Ask HN: Self-taught webdev with lots of free time. What s... by alexdowad on Wednesday August 12, 2020 @04:50PM (#24136802)
This is a far better idea than "Operating Systems: Three Easy Pieces" as suggested by the OP.