Which one LLM book? I've got so much other stuff I'd rather learn and code I'd rather write (C/wasm backend for my language), but I've also started job hunting

Which one LLM book? I've got so much other stuff I'd rather learn and code I'd rather write (C/wasm backend for my language), but I've also started job hunting and probably should understand how this latest fad works. Neural networks have long been on my todo list anyway.