A fundamental component of classical art training was copying works by masters.
What are the masterworks of software engineering?
The nice thing about them is that they are open source so you can have a look at how they have been implemented and probably step up your C and systems programming game a lot.
https://www.folklore.org/StoryView.py?story=Round_Rects_Are_...
https://en.wikipedia.org/wiki/Fast_inverse_square_root#Histo...
The closest equivalent, I would say, would be learning the simple elegance of algorithms and data structures like quicksort or the linked list.