Chapter 1, WordPress Overview and Installation, walks you through a high-level overview of WordPress, from getting it up and running, to its key features such as plugins and themes.
Chapter 2, Adding Geographical Capabilities via the GeoPlaces Theme, talks about creating a location-based directory via the GeoPlaces theme. It covers the setting up and addition of sample geographic data into your WordPress site.
Chapter 3, Extending WordPress Using JSON-API, covers how to create your very own API that exposes WordPress's functionality with the JSON-API plugin. From here you'll see how you can quickly create a third-party app based on your WordPress site's content and its exposed API.
Chapter 4, Building Mobile Applications Using ...