The book explains how to develop reports with auto design and precision design. On a little more advanced level it also explains how to create drill through reports, matrix and chart reports. All of these areas are explained through straightforward steps to follow.
Report deployment and maintenance is also covered.
A particular nice chapter covers the UI for reports and the related data contacts. If you have trouble understanding the Model-view-controller (MVC) pattern used in AX 2012, I can really recommend this chapter.
For reference the book has a good appendix with list of common functions, and do's and don't lists for AX report development.
Here's a link to the book: http://www.packtpub.com/developing-ssrs-reports-for-dynamics-ax/book