Help!
While we'd like to think that this book will cover every single possible topic you would need for all your jQuery Mobile needs, most likely there will be things we can't cover. If you need help, there are a couple of places you can try.
First, the jQuery Mobile docs (http://jquerymobile.com/demos/) cover syntax, features, and development in general, much like this book. While the material may cover some of the same ground, if you find something confusing here, try the official docs. Sometimes, a second explanation can really help.
Second, the jQuery Mobile forum (http://forum.jquery.com/jquery-mobile) is an open-ended discussion list for jQuery Mobile topics. This is the perfect place to ask questions. Also, it's a good place to learn about problems other people are having. You may even be able to help them. One of the best ways to learn a new topic is by helping others.