Grammer

Commas

- Listing

- Appositives

Commas help a sentence become more formal and punctuated.  

Appositives

You need to know why you're going to put a comma and where you're going to put it. We use appositives when we wants to replace the noun that we used. The comma helps with that. It seperates the piece of info from the noun. 

A noun or noun phrase that renames another nounriight beside it. Appositives rename a noun.