Instructor told us about the club usage but I forgot but manage to find out.

SW = the sand wedge - its to get ball out of the sand - it is a very steep slope faced club PW = the pitching wedge - only to be used when you are near the hole - it will put the ball high and drop down straight so it does not roll very far

9 iron is for about 50 - 100 yards away from the hole and will send the ball quite high

8 and 7 are the same but will give you distance also , 7 is further

3 iron the furtherest - 9 iron the closest

oh why I cannot remember!!!