The rules and guidelines for D&D Beyond can be found here: Site Rules & Guidelines. The rules and guidelines outlined there are to be followed if you wish to make use of the commenting and posting systems on D&D Beyond. Users who do not follow these rules will incur the wrath of the Dragon Queen herself (or the moderators).
These rules are applied globally to the website, in addition to any forum specific rules that some forums may have. Please refer to those forums and their relevant stickies to ensure you are in compliance with the rules.
In addition to the rules specific for D&D Beyond, we also abide by the Twitch Community Guidelines.