Dr. Dobbs Journal of Computer Calisthenics and Orthodontia was my goto, I boot strapped my first C compiler from Ron Cain's Small-C code.

* https://en.wikipedia.org/wiki/Small-C

* https://github.com/trcwm/smallc_v1

I remember feeling like a professional my first time reading an issue Dr. Dobb's I got at an airport on the '90s.