I don't think it has communities like Lemmy - it all seems to be kbin.social so it is all local. However, if you head over to Lemmy and locate the communities you want to follow from their big list (like the beehaw.org communities), you can add them to your kbin subscriptions and follow along from kbin. The only difference I've found is that Lemmy community links start with the ! sign, so that has to be changed to @ when you search for the community through kbin.
Edit: I'm keeping my kbin and my sh.itjust.works accounts for now to see which I prefer.