#2

1. Use a comma to separate the elements in a series.
EX: Will you pick up my hat, shirt, and my golf clubs.

2. Use a comma + a little conjunction (and, but, for, nor, yet, or, so) to connect two independent clauses.
EX: I hit a solid shot, but it hit the cartpath.

3. Use a comma to set off introductory elements
EX: Walking to the wrong hole, he noticed how silly he looked.

4. Use a comma to set off parenthetical elements
EX: The brand new golf ball, which is expensive, was a very good find.