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I still don't really get it. Doesn't matter tho still enjoying it.
There are thousands of independent reddits in the Lemmy sphere. These are called "instances". If two instances federate with each other (what most of the big instances do already), content from one will show up in the "All" feed of the other and you can participate there using the account of your "home instance". You can comment as well as post and vote there. Creating a community is the only thing you can't do on foreign instance.
There's only one caveat: You need to use the correct URL in order to be able to participate. If you're from lemmy.world and want to participate on a community on sh.itjust.works, you need to use the URL "lemmy.world/c/[email protected]" instead of "sh.itjust.works/c/Community", which is a little confusing at first.
tl;dr: Imagine if subreddits had their own set of subreddits.