Just joined Lemmy today. From what I understand, there are different Lemmy instances that host different communities. I supposed that to interact in a community hosted in a certain instance, I would need to create an account for that instance. Ended up creating 10 different accounts.
On one hand, you only need one.
On the other hand, it's early days: we don't really know whats going to be stable in the long run, which communities will be co-opted by the admin going rogue, which will wither until they stop being hosted, etc. So I grabbed accounts with several instances. If they all fail its no big deal, I'll make more elsewhere then, but no harm having several either.