First of all, you must know what is Selenium. So, Selenium is an open-source technology, which makes it more preferable than QTP(Quick Test Professional ) which is a licensed one.
Here are some of the important reasons why selenium is more popular than other testing tools:-
The first reason is Selenium supports many programming languages which include Java,Python,Pearl,Ruby,PHP,.NET(C#) and many other programming languages. You required to be comfortable with anyone language in order to operate selenium.
You can also develop your test cases using IDE’S that you are already familiar with like Eclipse, Visual Studio, NetBeans.
You can operate Selenium on almost every OS.
Selenium has full documentation of all its functionalities, operations and usage. These things make your learning the tool much simpler.
Selenium has great extensibility and flexibility, along with its tight integration with the browser unmatched by available proprietary tools.
Here is a tutorial on Selenium that you can go through for better understanding of Selenium tool.
Selenium also provides support for the integration of open source frameworks like TestNG, JUnit, NUnit and so on.
If you want to learn Selenium with having a decent and valuable certificate then you must take up the following Selenium Training Course. You can also watch the video tutorial to learn Selenium in a better way. .