I am sending out an informational email to some (adult) guests we are going to have on charter with us next September - mostly about where we are going, what the boat looks like, some Youtube videos with basic sailing skills, etc... I don't want to inundate them with rules in this email, but thought it might be worth mentioning just a few of the most important safety rules. Of course we'll do a more comprehensive boat and safety briefing when we get to the boat, but I'm thinking they'll return to this email periodically between now and then so I'd like to highlight the top few rules. What are your three (and only three) most important boat rules that you enforce on a novice crew?