“But How Do It Know? - The Basic Principles of Computers for Everyone” by J Clark Scott. It’s a short self published book aimed at laypersons written in a very simple, sort of conversational style. Through the whole book he guides you to building a functioning computer that does some bitwise operations. I built most of the computer in a simulator program called Logism (cburch.com/logisim/).

I’d recommend it if you’re looking for an easy introduction to the topic. It was a fun read for me. Get the print version; some of the diagrams in the Kindle version are badly compressed.