The rules of golf are relatively simple once you know them, but they take a while to explain. If youre not even sure of the basics, read this: the object of the game is to hit your ball from the start (tee) of each of the 18 sections of the course (holes) into the hole itself. The hole is situated on a particularly short and well-maintained piece of grass (the green), and once youre on the green you must use a putter (a club with a slab-like end) instead of a normal golf club.
Each one of the holes has a certain target number of shots, known as the par. On a par 4 hole, for example, you are trying to get the ball into the hole in four shots or fewer. If you take exactly that number of shots, you have scored par. One under par is a birdie, while two under is an eagle. Three under is very rare, and is called an albatross it is only possible if you get the ball in the hole with two shots on a par 5 hole. The best score of all, however, is a hole in one, which is when you hit the ball straight from the tee into the hole.
By the same token, if you dont make par, there are special words for that too. One over par is a bogey, while two over par is a double bogey, and so...