Sometimes golfers let themselves go and they dont follow the first rules they were probably first taught. Golf etiquette (often misspelled as: edicate) is one of, if not the most important parts of the game. There are a few main things that golfers seem to forget about.

Be quite while others are hitting
Dont hit-up on other golfers
Rake the sand after your shot
Fix your ball mark or divot on the green, fairway and tee box
Talley your scores at the next tee box and not the green

Constant though out the game you must follow golf etiquette like being quite while someone is lining up to hit, and not to hit up on other golfers in front of you. Then at each part of a golf course you have etiquette to follow.

Like at the tee box, not only keeping quite and respectful while someone is hitting, but you must fix your divot and if you broke your tee than throw it away, dont just liter up the tee box. Te boxes get chewed up quick so each player must hold their own.

Then once you come up to your ball in the fairway, again you must fix your divot, and wait for the players in front of you, but if you end up in a sand trap you must rake the sand after your shot to allow other golfers to have a better chance of a good lie. Once on the green the first thing you need to do is follow your path to find where your ball landed and fix your ball mark or divot.

By fixing your divot you are repairing the green and keeping it in great condition for all the other golfers. Beyond the rules of golf etiquette goes a long way and if every golfer just does their own clean up it will the course in better condition. Look here for more info: http://www.tydaniels.com/divot-repair-tools/