Hitchcock's rules of dancing/dueling are a set of important principles that Hitchcock makes sure to impress upon his students, as repeated by Carolyn and Caroline Fair-Play. They may or may not be identical between brothers and between disciplines.
Never trust a priest you don't know.
Always carry a weapon.
[exact wording unknown, has to do with running away]
Have a lockpick.
It is bad luck to celebrate before you succeed at something. [number unknown]