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I really loved this book: https://www.amazon.com/Code-Language-Computer-Hardware-Software/dp/0735611319 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.