This is fun! I want to try it out with my students! And I want to get the other books in the series (there are 4).  It begins with a basic introduction to what coding is, and defining some key concepts like input and output.  It explains that there are different computer languages and tells where readers can download, or access online two different free resources, Logo and Scratch.  It then goes on to explain quite clearly how each of these work, giving lots of simple exercises to try.