This document discusses the rules for using commas in sentences. It outlines 11 main comma rules, such as using commas to separate elements in a list, set off introductory phrases, and separate two independent clauses joined by a conjunction. The rules also cover using commas around quotations, between a city and state, date and year, and in greetings/closings of letters. The document concludes by listing some incorrect uses of commas, such as separating subject from verb or verbs in a compound predicate.