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Code: The Hidden Language of Computer Hardware and Software.

Wonderfully written book on how computers work.

It's even a good read for the curious non-technical reader. However, some chapters might be a bit hard for them. The first road block seem to be the chapter on logic gates, but with some help it's not that bad.

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And once you've read that, continue with "Operating Systems: Three Easy Pieces", and "Crafting Interpreters".

CODE is great to get a sense of what a processor is and does.

Operating Systems shows how processes, file systems, and hardware abstractions make a processor useful to users.

Crafting Interpreters implements a programming language on top of that.

With these three books, you have a good overview of how a computer works.

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