Instruct: Classify Amazon reviews into positive or negative sentiment
Query: excelent book, if it was free

This book contains very little of information, but will get the begineer off to a good start. All of the technics and terms are presented in a very easy to understand manner. However, by searching the internet for "blackjack strategy" or something similar to that, you'll find many free sites with very similar stuff withing 10 minutes.