These guidelines are a work in progress, but here are a few basic pointers to begin with.
Be courteous. There is a zero-tolerance policy for bullying, hate speech, and discrimination, no matter the basis.
No self-promotion. This community exists to help authors share knowledge on how to succeed in indie publishing, not to promote your writing or your services. (Depending on interest, there may be weekly/monthly threads for service offers.)
Remember that there is no one-size-fits-all solution in publishing. When asking for advice, be specific about your situation. When sharing it, remember that what works for you may not work for everyone.
This list will expand and be refined over time. Until then, be nice.