We're now back to email threads again it seems. (This is not the criticism it might seem, I miss the days of long-form proposals discussed through email, it promotes a kind of thinking that Slack etc doesn't).
https://jkorpela.fi/usenet/laws.html
Most of the best discussions I've had online followed those rules.
(OTOH, those rules are written tongue-in-cheek and not likely to be understood well by most newcomers.)