I'm reposting my noob question here if anyone wants to give advice. Thanks in advance >>106496190

I want to program my own indie game without any spaghetti code, what books should I read for this? I already understand some of the basics like: functions, classes, variables, and callbacks but I don't know how to structure and plan out my code, so I always feel lost. I basically never know what the best course of action is. I also code in c# but I assume that's probably not relevant since I'm not asking for language specific advice.