Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Readily Applicable

The great thing about this book is how directly the author gets to the point. It's a small book, but loaded with punch. The rules are simply that, rules. There isn't a lot of theory here. It's all about things you can do to make your business's marketing more effective. This is a fantastic resource that I'm sure I will refer to again and again.