Guide covers grammar, punctuation, spelling, cliches, and jargon.
Chicago Manual of Style - site designed to help CMS users eliminate ambiguities or misunderstandings found in the book itself. Common Errors in English - An explanation of common English usage errors and how to avoid making them. English 126 HyperTextBook - Modern English Grammar from the Daniel Kies and the College of DuPage. English Grammar - Clear and practical help with English grammar, primarily directed toward people who are learning English as a second language. English Grammar Tutor - An online grammar book for student editors.