Jason Coleman & Brian Messenlehner 
Building Web Apps with WordPress [PDF ebook] 
WordPress as an Application Framework

Word Press is much more than a blogging platform. If you have basic PHP, HTML, CSS, and Java Script experience you can use Word Press to develop fast, scalable, secure, and highly customized web apps, mobile apps, web services, and multisite networks of websites. Along with core Word Press functions and database schema, youll learn how to build custom plugins, themes, and services for just about any kind of web or mobile application.In this updated second edition, Brian Messenlehner and Jason Coleman cover new features and functionality added to Word Press up to version 5.4. All code examples in the book are available on Git Hub.Compare Word Press with traditional app development frameworks Use themes for views and plugins for backend functionality Get suggestions for choosing or building Word Press plugins Register custom post types (CPTs) and taxonomies Manage user accounts and roles, and access user data Build asynchronous behaviors with j Query Use Word Press to develop mobile apps for i OS and Android Integrate PHP libraries, external APIs, and web service plugins Collect payments through ecommerce and membership plugins Learn how to speed up and scale your Word Press app Extend the Word Press REST API and create custom endpoints Learn about Word Press Gutenberg blocks development