The online course that I took made a college class on logic gate echelon stuff an absolute cakewalk to me, and fully familiarized me with a lot of the concepts in "the hard way" (doing it), so that I was ready to learn the tips and tricks later. I cannot second this recommendation enough.

This book was amazing since it had you starting at the transistor level, building gates, components, the entire CPU/RAM, ASM, and finally building a mini OS to run on the entire platform.

Could not recommend enough.

I recently read Code by Charles Petzold and it quickly become one of my favorite books, this seems like a great follow-up

That book is amazing. It inspired me to look for more resources on computer architecture and Verilog, and after a while I had a very simple but functional CPU in Verilog that can compute prime numbers [https://github.com/f00zz/rei].

Glad to see this here. Really took away a lot of the "magic" that intimidated be about the lower level operations of computers.

There's a good web app companion to the first half of this course at http://nandgame.com/ as well.

Second this, great book.

I was here just to add this book if not added.