Oh, the period. It's so simple. So we don't have to go over it, right?
Well, actually, the period is often difficult to figure out around its enemy, the parenthesis.
If you use parentheses within a sentence, use a period after it (so after this parenthetical thought).
Let's see what happens if you use a parenthesis on its own. (The period goes inside the parentheses.)
Do you see the difference? It seems simple, but this rule is often overlooked.