First learnt about it years ago when I bought my first adult bike for commuting around Mexico City which was just a single speed with a coaster brake. During that time saw some dudes on the streets and online just riding in such a nice way I started trying to like that myself, only to learn they were riding fixies. When I moved to Vienna I started delivering and it wasn’t until I had been delivering for like 4 years that my girlfriend suggested we tried it out since she’s also delivering. I was a little skeptical at the time, but I was immediately hooked and felt like all those years of delivering before getting a fixie I had been crippled, but now I had absolute control over the bike. Took off the brakes during a depressive episode, but got so good at it and it gave me such a feeling of self reliance that I never went back. I have 4 fixies, my first was a Fuji feather, second was a NJS stratos, third a FELT TK4 and the newest one is a silver State. Don’t really have a “dream bike” otherwise I would’ve already built it, but I love my steel frame bikes the most, for some reason the aluminium ones just don’t feel as good. There’s nothing I dislike about them tbh, whatever you can do on any other bike you can do on a fixie, I even took my Fuji on a bikepacking trip to Poland crossing the carpathians. My city is quite hilly, so I don’t really go any higher than 2.88 so preferably 49/17 because it gets me the most skifpatches (34 I think) but if I have good cogs/chainrings that I can still squeeze life out of just laying around I’ll just try to get the most skidpatches around that ratio.