All the three books you've listed focus on APIs and code. It's also useful to know what's going on in the machine so that these APIs can be understood more easi

All the three books you've listed focus on APIs and code. It's also useful to know what's going on in the machine so that these APIs can be understood more easily. The "Operating Systems - Three Easy Pieces" is one great book that has already been mentioned. I would also suggest "Computer Systems - A Programmer's Perspective" along the same lines (https://csapp.cs.cmu.edu/ https://csapp.cs.cmu.edu/). Computer Networking is another field you're likely to run into. "Computer Networks: A Systems Approach" is a good book (https://book.systemsapproach.org/ https://book.systemsapproach.org/)