My take for the fediverse would include:
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Again, downvote not for disagreement but for content that clearly does not contribute to the discussion. Reason should not be given, as downvoting should be done sparingly and should not require a reason (for most sane human beings).
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Be aware when interacting cross-instances. Culture, norms, and rules may differ.
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Unless the instance operator is fine with it, limit your self-content sharing and self-promotion.
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Remember that most of the fediverse instances are independent and they owe you nothing. The instance operator's decisions are final.
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Do not squat names on multiple servers unless it's what you generally have been using.
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Cats are still the supreme beings. The fediverse resides on the Internet (assuming that it runs on TCP/IP), so the cat supremacy rule applies.