Usage rules present the essentials for correct and clear communication in Standard Written English. Besides rules for punctuation, usage includes guidelines for the following:
Dangling and Misplaced Modifiers
Avoiding Comma Splices and Fused Sentences
Avoiding Faulty / Incomplete Comparisons
Verb Tense Consistency
Commonly Confused Words
Usage also includes matters of punctuation, including correct use of end marks, commas, semicolons, colons, dashes, parentheses, apostrophes, italics, and quotation marks.