If you're producing an actual functioning compositor you should be using wlroots anyway. It's unopinionated, we call it "40,000 lines of code you were going to write anyway". It's not practical to make a compositor without leveraging wlroots unless you have a huge team like GNOME or KDE - this is advice from several compositors who tried and are now using wlroots.

Still, if you insist on making everything yourself, the wlroots code is pretty accessible and I've heard from people working on KDE and Mir that it's the best reference code to study for understanding how everything works and applying it to their own software.

https://github.com/swaywm/wlroots