It was a quick read, gave a good overview of the subject. The explanations are simple and easy to understand. I had a few issues with the grammar but it was balanced out with the examples given. My advice would be to pay more attention to editing of the material to fix the spelling mistakes. More details could also be provided since it was quite simplistic. Overall it's useful if you have zero knowledge of the subject but I don't recommend this for individuals who have deeper knowledge of this particular subject.