any reviews about that google adwords guide

Sorry for offtopicmessage I only wanted to ask your thoughts for this google adwords tutorial. I some days ago came across that site : google adwords tutorial and they wrote that that tutorial will give information you how to advertise with google adwords. I still don't know to buy that or no? So many utorials I purchased but many was waste of time. I just thought some of you know about it or purchased this tutorial? Can you give your thoughts?