The article provides a comprehensive guide on writing test scripts in Selenium, an open-source automation testing framework popular for web applications. It covers the basic setup of Selenium on a system and details how to write test scripts using various programming languages, compatible browsers, and operating systems. The text discusses components of Selenium like Selenium IDE, WebDriver, and Grid, highlighting the new features in Selenium 4, such as relative locators and W3C compliance. It emphasizes the advantages of using Selenium's cloud-based Grid, like LambdaTest, for parallel and cross-browser testing, which significantly reduces execution time. The article also demonstrates setting up projects in Java or Maven, configuring browser drivers, and executing scripts locally or on the cloud, with practical examples of login tests. Additionally, it explains parallel testing using TestNG to improve efficiency and test coverage. The content aims to assist testers in effectively utilizing Selenium for automation testing, providing detailed instructions and code snippets for practical applications.