Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Trees died for this?

It is an absolute pity that many trees died to publish this worthless piece of drivel...twice! This book is clearly targeted at youngsters (pandering comes to mind), fails miserably at conveying a fundamental knowledge base from which one can develop further technical skills, and in summary appears to be a platform for the author's personal agendas. Don't buy it. I recommend you invest in Hacking Exposed instead.