Ext JS Themes and Styles training focuses on customizing the look and feel of web applications to create consistent and professional user interfaces. This training explains how Ext JS uses theming architecture, including Sass-based styling and built-in theme packages. You will learn how to modify default themes, apply custom styles, and control layout appearance across components. The course also covers styling grids, buttons, forms, and panels to match application branding requirements. It explains how to create reusable style configurations and manage theme switching for different user experiences. This training is ideal for developers who want to enhance UI design skills and build visually appealing enterprise web applications using Ext JS.