I've cracked into quite a few programming books over the years and it's pretty crazy how much of an advantage it's given me. I'm a lowly systems engineer, not even a real programmer, but I definitely understand networking better than the majority of programmers at my company because I read Stevens' TCP/IP Illustrated 10 years back. (and I read the OLD version from the 90s that was already dated when I read it!) And then I read UNIX Network Programming to help understand all the different sockets APIs and that's paid dividends too, because I get our network programming code better than most of my coworkers too.
Then there was that one time I was self-studying computer architecture (Computer Systems: A Programmer's Perspective) and was able to turn what I learned around and hack our binary code at a customer site because I wasn't in an environment where I could compile our code... and then years later, when I wanted to analyze the ROM of a 90s electronic device with a much simpler instruction set than x86, I wasn't afraid to crack open the thing in Ghidra
Let's see, what else have I read that's paid dividends over the years:
- Modern Operating Systems (Tannenbaum)
- Learning Python (Lutz)
- JavaScript - The Definitive Guide (Flanagan)
- Programming PHP (Tatroe)
- Learning Web Design (Robbins)
- Algorithms (Sedgewick)
- A book I read whose name escapes me now, about technologies like RS-282/RS-484 and serial communications in general
- (I could probably put down Cuckoo's Egg too as an "inspiration" for me ultimately getting interested in computers and networking, and I bet that's not too uncommon a story)
It's probably a sign of my age (mid 30s for reference), but when I'm curious about something and want to learn it really deeply - I look for a good book on the topic. (although I'm willing to admit that maybe this process hinders me in some ways, because it means I sometimes spend more time studying than I actually do working with a thing - I have spent a LOT more time reading about circuits than building them - but I like studying so I'm happy either way)