Etiquette is important if you don't want to annoy the other people in your group.
1. Wait your turn.
2. Be ready when it's your turn.
3. Stop moving and talking when it's other people's turn.
4. Watch your ball so you're not having to look for it after every shot.
5. Don't get overly pissed off, cuss all the time and / or throw clubs. People that do that are babies and shouldn't play the game at all. Ugly.
6. Mark your ball on the green if it's in the way.
7. Pull or tend the flag when on the green and you're closest to it.
8. Fix your ball marks, replace divots and rake bunkers.
9. Have fun.
Best ball is often confused with a scramble. Both are golf scoring formats: Best ball is a stroke play, team scoring format for 2 or more people playing on the same team. All people play the hole normally and the best score on the hole by any team member is your score.
A scramble is also a stroke play, team scoring format for 2 or more people playing on the same team. Each player hits a shot and then the team decides which shot is the best one to be taken. Each player on the team hits a second shot from the previous best shot and the team chooses which shot is best again. Process continues until the ball is in the hole. Each team member gets to play the hole from each best shot position.