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.
On recommendation from /r/soloboardgaming, I like both One Deck Dungeon and Through The Ages.
My career, a visual essay…
https://www.reddit.com/r/oddlyterrifying/comments/kklfq0/dogs_get_stuck_during_mating_because_of_a_process