Generally, Selenium tends to be the preferred option for automating web application testing due to its cross-platform compatibility, browser compatibility, open-source character, multiple language support, huge community support, ease of use, and connection with other tools. If you are interested in learning more about Selenium then I would suggest you to take up this Selenium Certification Course by Intellipaat. During this training you will be learning various concepts of testing. This training helps you to become an expert in Selenium Testing.