Elementary Rules of Usage:
Rule1: From the possessive singular of nouns with's
Rule2: In a series of three or more terms with a single conjunction, use a comma after each term except the last.
He opened the letter, read it, and made a note of its contents.
honest, energetic, but headstrong
Rule3: Enclose parenthetic expressions between commas
The best way to see a country, unless you are pressed for time, is to travel on foot.
Rule4: Place a comma before and or but introducing an independent clause
The early records of this city have disappeared, and the story of its first years can no longer be reconstructed.
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