Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Quite generic information

Perhaps just because there is little to do and things change quite frequently and abruptly. I bought the book as I was not able to connect my AppleTv to the mac and I got useful hints to solve the issue. Anyway a visit to a Mac store has been so far the quicker solution. So my suggestion is to buy this book only if you have no nearby Mac Store and you have a very quite naive knowledge of networks.