Building Test Automation Framework using Selenium and TestNG 

Understanding Test Automation Framework and creating a directory structure

Creating an automation layer and writing a generic method to invoke a browser and navigate to a URL

Writing wrapper methods to perform user actions

Creating an application layer - using POM or Page Factory as a design pattern

Adding logic to the application layer

Writing test cases in the test layer

Executing test cases via TestNG XML file

Reading configuration from config.properties

Generating logs and reports using Extent report

Adding screenshots to failed test cases and attaching to the report