Has the usual topics common to all shotgunning books: gun, fit, mount, stance, etc.
But this particular book is focused on the sporting-clays discipline specifically, talks in detail about approaches to specific types of targets, and also talks about how to approach setting up a sporting-clays course.
This last seldom-discussed subject (course setup) was interesting because most books omit this topic altogether. The treatment of the subject makes you more aware of the quality of different courses and set-ups, as well as the variability of the different stages over the course of a day. It opens your eyes to signs of a good course builder - how they build a course that appeals to all levels, and how they plan the predicted winning score for a shoot (artificially, with some impossible shots that allow luck to determining the winner, or "organically," with several challenging but hittable targets).