Rule#1 - When seperating phrases that don't need to be there.
Example- My dog,Dave, is awesome.
Rule#2- When linking two independent clauses with a conjunction.
Example- I really want to go swimming, but my sister wants to go to the park.
Rule#3-When your addressing someone in particular.
Example- Let's go somewhere, Dad.
Rule#4-When making a list.
Example-Make sure to get bread, apples, bananas, and milk.
Rule#5- When you have more than on adjective modifying a noun.
Example-Your a smart, wonderful kid.
Rule#6-After introductory phrases or clause.
Example-Once we are done eating, we will eat dessert.
Example-March 10, 2003
Rule #8- The ending of a letter.
Example- From, Carson
Rule#9- Geographic locations
Example- I live in Cumming, Georgia