This is the final book in the No Mistakes Grammar series, so be prepared to learn. We cover a lot of territory in this book. Things like: count nouns (data and media), linking verbs, comma usage, hyphenation, sayings and proverbs, appositives, more mispronunciations, words from other languages, and more.
There should be enough in here to keep you busy for a while. And I guarantee it will improve your grammar in an easy-to-understand style.