People love alcohol and they love doing all kinds of funny things with it, so there are surely more kinds of beer than you could ever hope to try or imagine. I’m more of a wine drinker myself, but even if you aren’t you’re probably well aware of the vast number of wineries and wines out there, and you know you will never try them all. Just find something you enjoy and always keep an open mind.
The differences are plentiful. Distilling process, spices added, filtration, intermediate steps in distillation, the list goes on. Some are more watered down, some are spicier, some have a citrus flavor.
My personal favorite beer (nobody laugh) is Blue Moon Belgian White wheat beer, which has a citrus-y flavor and is sorta girly.