Topic 1: The comma. Especially unnecessary commas. It's a bad habit of mine to put a comma there when I don't know whether or not it needs one. Mildly parenthetical ones are an issue for me.
Topic 2: The semicolon. I almost never know when to use a semicolon. I would usually avoid using them at all times. Knowing now that the two parts must be independent clauses now really helps me.
Topic 3: The quotation marks. I never knew how to do quotes inside of quotes. I would always just use more quotes. Using single quotes was nice to know.
Topic 4: I just learned there's a difference between hyphens and dashes. I've always used hyphens as dashes. This is new to me.
Wow I didn't even know you can quote within a quote or that there was a difference between hyphens and dashes. I'll have to look into that.
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