I would suggest you go for online Selenium Training. I have found Intellipaat who delivers your industry acceptable Certified, the course is being taught by experienced Trainers.
Let's know something about Selenium:-
Selenium is an open-source automation tool which is used for automating Web Applications. In this course, you will experience to work with Data Driven Framework and Keyword Driven Framework and perform Cross-browser testing. Selenium IDE, Selenium RC, Selenium WebDriver and Selenium-Grid are covered during the course. You will learn to perform tests on multiple machines simultaneously running on different Operating Systems, integrate other frameworks like JUnit and TestNG with Selenium.
You can learn more on Selenium from here:-
Selenium Tutorial- Selenium Tutorial – Learn Selenium from Experts.
Selenium Interview Questions - Selenium Interview Questions and Answers.
Here is also a Selenium video tutorial which you can watch to learn it in a much better way. .