In the book's updated second edition, the authors use examples from their recently released SchoolPress app to explain concepts and techniques throughout the book. All code examples are available on GitHub.

Compare WordPress with traditional app development frameworks
Use themes for views, and plugins for backend functionality
Get suggestions for choosing WordPress plugins—or build your own
Manage user accounts and roles, and access user data
Build asynchronous behaviors in your app with jQuery
Develop native apps for iOS and Android, using wrappers
Incorporate PHP libraries, external APIs, and web service plugins
Collect payments through ecommerce and membership plugins
Use techniques to speed up and scale your WordPress app