It depends on what you’re after from a server.

There’s region specific ones, like the server I’m on just now (feddit.uk) being UK themed. That means when I look at my “Local” feed it’s generally filled with content specific to the UK. There’s others for Canada, Netherlands, Denmark, etc, probably US states as well I would assume.

Or maybe you’re after a server with a political ideology. Lemmy.ml is for Marxist-Leninists, dbzer0 and slrpnk.net are for anarchists, and there’s even a MAGA themed server but I forget its name just now and don’t care to go searching.

There’s also servers that aim to be just a general purpose, jack of all trades master of none kind of place. Your server, Lemmy.world probably being the biggest of those. It has a bit of everything and doesn’t really specialise in one particular topic. Probably the closest to a clone of Reddit.

There’s also servers that are supposed to be safe spaces for particular groups of people. For example, blahaj.zone is for LGBTQ+ people (or those just fans of cuddly shark toys).

As markz said, have a browse of this site to see all the servers and see which fits best with what you want from a link aggregator site. There’s nothing stopping you having accounts on different servers for different purposes either. They all have different rules, content, and block lists so the experience on each is unique.

Good luck exploring, welcome to the Fediverse, and have fun!

https://join-lemmy.org/instances