@bits For an even more basic understanding of concepts, I recommend this PVS Crash Course Computer Science series. This episode walks you through a very basic CPU with a simple instruction set to understand the concepts. I really appreciate the visual step-by-step. The following episodes moves more into assembly. It was a great base for me to start reading more about the more complicated instruction sets in this blog post.
https://www.pbs.org/video/the-central-processing-unit-cpu-crash-course-computer-sci-v5aynn/