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It's like Reddit, but not owned by a large faceless corporation intent on using it for social engineering. That being said, if you disagree with the political ideology of some instances they'll give you a ban for racism and not qualify it. Eg don't talk badly about Russia or Palestine on lemmy.ml posts. Generally, be nice and people will reciprocate. Except lemmy.ml.
Now I don't understand anymore? Lemmy bans you if you talk bad about Russia??!?!
A few instances are ideologically driven. So lemmy.world and lemm.ee tend to be pretty straightforward instances politically slightly left of centre but there are others like lemmy.ml and hexbear that push Kremlin/CCP propaganda. Anyone can set up an instance and federate with the other instances. But instances can also de-federate with specific instances. For example most instances have de-federated from hexbear and threads so posts made to them won't show up for users who use lemmy.world for example.
some instances or communities will flat out ban you for almost nothing, just accept that there are bad actors participating in lemmy and don't worry about blocking instances or users when you see it happening
after a bit you wont notice them and you will be better off for it