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 Shifts
Usage also includes matters of punctuation, including correct use of end marks, commas, semicolons, colons, dashes, parentheses, apostrophes, italics, and quotation marks.