I also recommend "The Sense of Style"; knowing how to wield punctuation and grammatical structure is critical for clearly and successfully articulating your ideas. I use semicolons, colons, and parentheticals heavily (but en dashes and em dashes are great too).

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I also recommend "The Sense of Style"--knowing how to wield punctuation and grammatical structure is critical for clearly and successfully articulating your ideas--and I use semicolons, colons, and parentheticals heavily (but en dashes and em dashes are great too).

I find that dashes are great for conversational style flowing sentence structure, but sometimes they can become too long and tiring to the reader.