USGA Handbook "The Game, Player Conduct, and the Rules"

"THE SPIRIT OF THE GAME" 

Unlike many sports, golf is played, for the most part, without the supervision of a referee or umpire. The game relies on the integrity of the individual to show consideration for other players and to abide by the Rules. All players should conduct themselves in a disciplined manner, demonstrating courtesy and sportsmanship at all times, irrespective of how competitive they may be. 

BE READY TO PLAY

Players should be ready to play as soon as it is their turn to play. When playing on or near the putting green, they should leave their bags or carts in such a position as will enable quick movement off the green and towards the next tee. When the play of a hole has been completed, player's should immediately leave the putting green.   Fill in your scorecard off the green and on your way to the next hole.

GOLF ETIQUETTE CORNER

• Don't move, talk or stand close to a player making a stroke. 
• Don't step on another player's line of putt. 
• Don't play until the group in front is out of the way. 
• Always play without delay and keep up with the group in front. 
• Shout a warning (Fore) if your ball may hit someone. 
• Repair divot holes and ball-marks. 
• Smooth footprints in bunkers. 
• Don't drop clubs on putting green or lean on your putter. 
• Replace flagstick carefully and in an upright position.