Among many of the selenium training institutes, I found Edureka to be more precise and up to mark with the latest trends and technology updates. They provide efficient and wonderful courses that has made me a better techie.
Learning it from experienced professionals and industry experts will definitely help you the same way it helped me. The course is designed in a way that would eventually give you insights about WebDriver Architecture, JUnit and so on
There are a number of blogs as well as videos on their youtube channel which will help you build your practical knowledge about the subject.
There are n number of online training centers in the market that help you with learning Selenium. A few notable ones are:
Hope this helps:)