In this chapter, we dived a bit into the more advanced topics that any PhoneGap developer should get into more detail once he/she has mastered the essential topics that we covered previously in this book. We went over the reasons why you should always test natively if it is possible, and found that debugging is not as straightforward as it is with a web inspector in the browser. We got to know about the UI frameworks that are available and specially built for mobile screens and learned some useful tips as well.