1. The document discusses how to navigate and extend the Flex framework by reviewing the source code included with Flex. It outlines key concepts like the component lifecycle methods (commitProperties(), createChildren(), measure(), updateDisplayList()), how to find classes and packages in the framework, and inheritance conventions. 2. Understanding the component lifecycle methods and when they are called is important for working with Flex. The document provides an overview of what each method does and the typical order they are called. 3. The Flex framework source code is a valuable learning resource that contains many code examples and design patterns that can be reviewed and learned from.