it's not often that shit just works

Perhaps something like

https://www.tutorialspoint.com/unix/index.htm

https://www.tutorialspoint.com/unix/unix-getting-started.htm

My “I’m a CS” colleagues all tell stories about the OS they created in uni. A couple of them were happy stories.

https://ocw.mit.edu/courses/6-828-operating-system-engineering-fall-2012/

It’s good to know how to do it, but there is not much need to go and do it.