In this chapter, we will learn how to build a simple "Hello World" application for different environments, gain an understanding of the project directory structure, and learn how to create skins for specific devices. Using Worklight to create user interfaces offers a big development advantage on the client and server sides. In general, developers face problems during development. Support for the creation of hybrid apps using other products is typically not easy to define use cases and conduct debugging and preview testing for enterprise applications. However, with Worklight, developers can create simple architecture and amend enhanced structures to generate mobile application.