This chart from Grammar Girl Presents the Ultimate Writing Guide for Students gives examples of the 15 most common ways to use a comma. Some of the items represent style choices instead of rules, such as how to use a comma in a list, but when you’re making a simple list, you have to make choices! We hope you find it useful.
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opens in a new windowCommas: Oxford, Appositive, and Nonrestrictive
opens in a new windowThe Comma Splice
opens in a new windowWhen to Use a Comma Before ‘Because’
opens in a new windowCommas with Participial Phrases