The UI5 User Guide gets the reader started quickly with OpenUI5/SAPUI5 development. Step by step, it shows how to develop a basic client web application, introducing concepts and flow of developing with UI5 along the way. You can reuse the resulting code as a template for any serious UI5 application.
After getting started, the main content of the book is divided into three parts:

The first part of the book explains the basics of UI5 development. It is written to allow the reader to easily find practical solutions for common development tasks. The second part of the book goes into depth showing how to separate critical issues, like request handling and business logic from UI5. You will learn how to significantly speed up form generation and how to consistently implement data validation. The third part of the book integrates the previously covered aspects into an example application.

If you are interested in finding out how UI5 works, or if you have to work with UI5 in your projects, this book is for you.

For more information, visit the book’s website.