1. Use comma to indicate a break of pause within a sentence
e.g. Bill Gates, CEO of Microsoft, is the developer of the operating system known as Windows.
2. Use a comma when listing three or more items in a series.
3. Use a comma to separate two or more adjectives describing a noun.
4. Use a comma to separate a larger geographical area from a smaller one located within it.
5. Use a comma to separate an introductory phrase from the rest of the sentence.
e.g. After the show, John and I went out to dinner.
6. Use a comma to separate two independent clauses
7. Ryan went to the beach yesterday, but he forgot his sunscreen.
Having two independent clauses in a sentence simply means that you could split the sentence into two shorter sentences while preserving the original meaning. If your sentence contains two independent clauses that are separated by a conjunction (such as and, as, but, for, nor, so, or yet), place a comma before the conjunction.
e.g.Ryan went to the beach yesterday, but he forgot his sunscreen.
8. Use a comma when making a direct address
Amber, could you come here for a moment?
9. Use a comma to separate a direct quotation from the sentence introducing it
