Inappropriate Content:

NO swearing, abusive language, inappropriate topics or jokes, misleading information, or any kind of spam (including switching instances).

and NO inappropriate capes, skins, usernames, item names, signs and names.

Advertising:

None anywhere unless specifically given permission

Threats:

NO threatening to or actively doxing, DDOSing, harassing or blackmailing others, sharing personal information, or sending malicious links.

Unfair Advantages:

NO disallowed modifications, macros, bug abuse, exploiting, boosting, scripting, or punishment evading.

Modifications that are allowed includes fullbright, (mini)map, freelook (not freecam!) and similar or widely regarded not cheating, hypixel has a great resource on this

Others:

NO ban evasion or leaking people's personal stuff (names, voices, faces, etc) unless they give permission!

Mods can also decide if something is rule-breaking even if it isn't in the rules!