Instruct: Classify a given review into positive or negative sentiment.
Query: Not useful for me at all!!!!

Unlike a lot of positive comments about this book, I found it terribly difficult to underestand! There are things that have been over explained (that bores you to death) and things that do not have any/little explanations (things that I always had problem underestanding them)! What sort of begginers book is this?!