how do i make file

Incremental compilation is nice, but expressing dependencies between objects, sources and headers is a pain in the ass. gcc -M is utter garbage not unlike GCC itself and generates thirty to fifty useless prerequisites per file in case one of the system headers changes. Gotta make sure, the user might be retarded after all.

How do I write good make files and still have time for actual programming?

The way the svope of headers are treated in C is the stupidest shit ever devised. It's more of the same old shit usual of standards assholes. Crap that is not useful to anyone at all, but is going to end up crushing you under the weight of years of stupid decisions. #pragma once should be default behavior.