While I was reading Julia Evan's "Behind "Hello World"[0] on Linux, I had some fun digging up the zsh[1] source code. Granted, I needed some help from Cody AI[2] and even wrote some notes from my learning
https://blog.yelinaung.com/posts/behind-hello-world-on-linux...
[0]: https://jvns.ca/blog/2023/08/03/behind--hello-world
[1]: https://github.com/zsh-users/zsh
[2]: https://docs.sourcegraph.com/cody