Ellipses are used to indicate missing text. They can be either three or four dots, depending on their usage.

The colon is one of the most powerful punctuation marks we have.  It signifies that what comes after is what you’ve been waiting for. It is the harbinger of the payload, a sign that says “information here” in big red letters.
It also shares a name with a body part that one doesn’t discuss in polite [...]

If you like rooting for the underdog, you’re going to love the semicolon. Although the en dash may be used even less, it’s not out of spite — no one’s ever heard of it. Not so with the semicolon. It is commonly rejected by lesser writers everywhere. Once you learn and apply the two simple [...]

The em dash, sometimes referred to as simply a dash, is one of the most versatile punctuation marks we have in the English language. It looks like this:
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You can enter it by typing ALT + 0151 (hold down ALT, type 0151, and release); many word processors will insert it if you type two hypens back [...]

The en dash replaces the word to in numerical phrases

Everyone knows how to use hyphens, right? No. In fact, there’s not even a good grammar rule about their usage, much less a general consensus.

Here are some common comma mistakes to avoid.

Setting off the subject from the predicate.
Jennifer and I, went to the store.
Adding only one comma of a pair.
The doctor, who was a gentleman left the room while I disrobed.
Not setting off non-essential clauses.
Doctor Who which is a long-running British T.V. series is undergoing a leadership [...]

Since the dawn of time, man has waged war because of deeply held beliefs. But none of these beliefs have been so divisive, so enraging, so trivial as the Oxford comma.

Problem:

Every time you set your pen to paper, some testy copy editor runs over and writes “comma splice” all over your work.
Solution:

Learn to use the comma.

It’s easy to lose your credibility as a writer. Here’s how!