Don’t look at c specifically, look at syscalls. This is the real api of the operating system. It will also be confusing probably, since it is in some senses lik

Don’t look at c specifically, look at syscalls. This is the real api of the operating system. It will also be confusing probably, since it is in some senses like thinking about how functions are implemented in assembly, but you don’t have to focus on the mechanics of how they work if that confuses you. One interesting exercise might be thinking about how syscalls are used to make up the standard library functions you are more familiar with.