The rules everyone knows but no one talks about, formally and officially here.
Or see the rules here: A Gumby’s Guide to Gym Etiquette
Rule 1: Respect the line. Before beelining to your favorite route and chucking your rope down, ask or at least look around. Make sure no one else was waiting to go next. If you’re bouldering, then be patient when approaching the wall. If there’s a horde of waiting people, use your best judgement to determine when it’s your turn. Also, the gym doesn’t issue VIP passes for 5.14 climbers. It doesn’t matter if you’re about to send the gnar. If other people were there first, it’s their turn.