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Dash, Parentheses, Bracket, Ellipsis, and Slash
This site contains information on the correct use of the following types of punctuation: dash, parentheses, bracket, ellipsis, and slash. Examples are provided for each of the uses discussed.
Harvard University
Harvard Writing Center: Tips on Grammar, Punctuation and Style
Rather than lists of rules, this site provides practical advice on the use of commas, semicolons, dashes, hyphens, abbreviations, acronyms, split infinitives, "this," "that," italics, and underlining. CCSS.ELA-Literacy.CCRA.L.2
Khan Academy
Khan Academy: Introduction to the Dash
Dashes indicate interruptions, set off asides, and show interruptions in speech. Learn the different functions of dashes in this exercise.