WikisWikipedia has a nice section on Wikiquette (see below) but here are some useful tips:

Take care when using words or images that might be considered offensive, obscene or infringe copyright.

Work towards agreement. If you are arguing, take a break. If you are mediating, recommend a break.

Recognise your own biases and keep them in check.

Edit warring (two or more sides fighting to make their version of the page the right one) is considered a breach or Wikiquette.
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