The Punctuation Guide was created by Jordan Penn, a longtime enthusiast of American language, usage, and style. He earned a BA in sociology from the University of California, Los Angeles, and a JD from the University of California, Hastings College of the Law:
In the early years of written English, punctuation served to mark pauses and other aspects of speech when text was read aloud. Over the subsequent centuries, punctuation marks were refined, eventually being used to indicate grammatical relationships between parts of a sentence. Today, punctuation serves both purposes, though the grammatical function dominates.
This guide shows the current style of American punctuation. British punctuation is slightly different, as explained here.
In creating this guide, I have consulted dozens of authorities, both online and in print. Where the authorities disagree, I either have explained the various positions or have presented the style I believe to be most useful. Fortunately, in most aspects of punctuation, there is general agreement. See More . . .