1. 6 Comma Rules

2. Use commas to separate items in a list
I want to eat chocolate, ice cream, and potato chips for dinner.

3. Use commas after introductory words or mild interjections.
Why yes, I am a crazy person.

4. Use commas to set off words that directly address a person.
Let’s eat, Grandma!

5. Use commas to set off nonessential parts of the sentence: clauses, participial phrases, and appositives.
Harry Potter, the boy with the lightning scar, fought Voldemort many times.

6. My dog chased his tail for thirty minutes, but then he fell asleep.
Insert a comma between two independent clauses that are joined with a coordinating conjunction
My dog chased his tail for thirty minutes, but then he fell asleep.

7. Use commas to separate subordinate clauses at the beginning of sentences
Before eating three candy bars, I should have thought of the consequences.