As the title implies, this is a book of questions and answers related to the SAP Sales and Distribution module. It is divided into nine chapters, each of which has from a dozen to 150+ questions and of course their answers. It can serve as a guide to preparing for the SAP certification exam, as a quick introduction, as a review of the module, or as a summary of the material in a big book on the SD module.
I find that this is a very handy book to use when I need a quick reminder about something. Its format makes it easy to find things. As an example if you need to know the transaction code for something, all of them are listed in a table beginning on page 135. But if you need to know what a transaction code is and how to use it, then you need to go to a bigger book. As such I recommend that you use this book in conjunction with a bigger handbook or reference book.