Bikes are fun! I loved ripping around them as a kid, but the moment I got a flat my dad threw his hands up and the bike was forever hung up. Flash forward to adult life and living in a city where owning a car isn't necessary, I commute everywhere by bike. A decent toolkit and youtube are enough to do most things and learning how to do simple repairs and adjustments on my bike has been empowering and satisfying. Working on bikes is a fun mechanical and delicate challenge!
Fun fact: a bike rolling down hill will stay upright longer than a standing bike.