On greens, repair all ball marks. Repair spike marks on the greens after finishing play. In other words, leave the course and particularly the greens in the condition in which you would like to find them. Therefore, don't play until the group in front is out of the way. Courtesy Don't move, talk, or stand close to or directly behind a player making a stroke.
Slow play is a huge aggravation.
Invite faster groups to play through. Don't step on the line of another player's putt.