The Comma (,)
105. Use the comma after each word of a series of words that all have the same grammatical relation to the rest of the sentence, unless conjunctions are used between all of those words.
Ours is a red, white, and blue flag.
He talked, smoked, and read.
He talked and smoked and read.
Do not, however, precede the series by a comma.
Wrong: He lectures on, Tuesdays, Thursdays, and Fridays.
Right: He lectures on Tuesdays, Thursdays, and Fridays.
106. Use the comma to separate two adjectives modifying the same noun, but not if one modifies both the other adjective and the noun.
An honest, upright man.