I'm still trying to wrap my head around the whole federation thing. I got my account created on lemmy.ml, but I see that I can set the front page include posts from the whole federation, be it beehaw, etc.
Now I'm confused about actually posting stuff. For example, on the lemmy.ml frontpage sidebar, there's a rule 3, no porn. Is it instance-wide? Or is it just for /c/lemmy community? Can I create my own community with nsfw comment? And if not, can I use a federation to post a nsfw content to an instance that allows nsfw from my account on lemmy.ml?
There's a docs page here: https://join-lemmy.org/docs/en/users/01-getting-started.html, but I feel there needs to be more comprehensive and idiot-friendly ELI5 version of federartion and how is it actually impleemented, because its such a huge paradigm shift which most of people are not used to.
EDIT:
Also, can I create communities cross-instance for example?
Rules placed on the front page of an instance are the instance-wide rules. So, no porn allowed on lemmy.ml.
Yes but on an instance that allows it. You'd have to make a separate user account there.
Yes. Unless the admins of an instance have reasons to block (not federate with) another instance, you can cross-post to any one that your instance federates with. It's even possible to an extent, to cross-post to other projects/networks. You'll have to follow the remote instance's guidelines, though.