My Good Gaming Manners are :
1, Respect your gaming commitments, or if Life prevents you, apologise (In advance if possible).
Dead lines of programming animate the robust, computerised Role-playing Game . These can be neglected and picked up again without consequence. But what you have here is a fragile creation, given life by the writing and imagination of a group of living people. Neglect it and you harm their hard work and creativity.
2. Read everything that the GM and the other players have written.
You cannot play a game of football ignoring the opponents and the other members of your team. The better a player reads these, the better the game. Role-Playing Games are similar. If you don't pay attention, you will only make a fool of yourself. But by intelligently reading what is going on, you give yourself the potential to add something breathtaking to the game.
3. Don't scribble off a reply and send it without re-reading.
As Role-playing Game Expert says, clear communication is important. Make it easier for the GM and other players by writing correctly. Use a spellcheck and grammar check. Remember that short sentences are easier to understand than long ones. Look for ambiguities. You cannot achieve your goals if your GM doesn't understand them.
4. Remember that you're in a team, not a competition.
While there may be a certain fun in playing a solo game, the experience of being part of a group is far more rewarding. This involves being a team player : don't try to do everything yourself. Learn the strengths of the other characters and give them their opportunity to shine too. If your barbarian usually dominates combat, allow the paladin his moment of glory against the undead. Step aside for the bard to talk to the NPC princess. Let the druid lead you through the wilderness. Enjoy their success.