Punctuation is important because those little marks are like signs along a roadway, helping your reader navigate your document. When you put punctuation in the wrong place, it can change the intended meaning of your sentence and send your reader in the wrong direction.
1) Putting a Comma Before 'and' in a Series (or Omitting the Comma)
The company makes pocket calculators, electronic keypads, and pocket translators.
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or
The company makes pocket calculators, electronic keypads and pocket translators.
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2) Using Two Spaces after a Period or Colon
3) Putting a Comma Between the Subject and the Verb
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In this sentence, a comma splits the clause's subject Billy, Peter and Mary, from the verb attend.
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A comma after Peter would also be OK in the above sentence.