Careful here. Absolutely start learning bash, but one of the points of Mint is that everything a normal user needs to do can be done through a settings gui. Don’t feel bad for reaching for the gui if you need to get something done and don’t have time right then and there to learn. Have fun!
Rimworld. You can do everything from hedonistic hobbit type colonies to the most despicable humans to have ever lived. Very relaxing to me.
When I’m feeling nostalgic, Shining Force II for the Sega Genesis.