Good etiquette with other divers, guides and boat owners for a more positive diving experience for everyone.
Diving is a community sport at its core, and behaving with high professional ethics raises the level of the experience for everyone.
Wait for the signal before entering the water if there are other divers coming up. Do not block the way on the boat and pay attention to other people's space.
Do not disturb another person's dive by stirring up sediment or moving randomly too close to it. Especially if it's being photographed.
The marine guide knows the location better than you. Follow him and listen to his instructions. If you disagree with him, discuss it after the dive, not during it.
The diver who is respected is the one who gives respect first.