1. The document provides guidance on common punctuation errors, including placing punctuation at the end of sentences, doubling up punctuation marks, and knowing basic punctuation rules. 2. Specific tips are given for punctuation usage with quotations, parentheses, capitalization, commas, apostrophes, colons, semicolons, dashes, hyphens and ellipses. 3. The document emphasizes applying punctuation rules appropriately for grammar and avoiding overuse or misuse of certain punctuation marks like parentheses, dashes and ellipses in formal writing.