Tennis
I play regularly, and badly enough to still be improving. Tennis is a game of recovering from your last mistake fast enough to play the next ball — which is a skill I would recommend to anyone who writes software for a living.
It is also how tenisplatformu.org came about. I joined the Çanakkale tennis community in 2023 and its admin team not long after — a community that needed better tooling than a group chat, and I happened to be the person in it who could build that. Around 120 players use the app now. Of everything on this site, it is the project I am most attached to: software that made a real thing better for people I actually see every week.