An Oxford, or serial, comma is the last comma in a list; it goes before the word "and." Technically, it's grammatically optional in American English. However, depending on the list you are writing ...

Updating Strunk and White. Link two thoughts with a semicolon, as in: He’s not even the real President; the other, even ...

When you reach the end of a sentence, you need a period, question mark, or exclamation point. Phrases or subordinate clauses standing alone are missing a subject or a verb or are stated in such a way ...