This document provides guidelines for proper comma usage. It outlines 10 rules for using commas, including using commas to separate elements in a series, connect independent clauses, set off introductory or parenthetical elements, separate coordinate adjectives, set off quoted material, express contrast, and avoid confusion. It also notes that only one comma should be used between a subject and its verb, and commas can be used for typographical reasons like between a city and state or date and year.