To rate any institute as best you need to experience one of the courses from them and according to me, intellipaat are the best online website which provides you with the best selenium training. Because I have experienced the course from them and I found many reasons to call the best. One is their trainers who are very experienced with more than 10+ years of experience. Their course content is awesome, and their support teams are just awesome they solve your doubts whenever you get. Here is the link to Selenium courses at Intellipaat.
To watch the Selenium video tutorials free of cost you can have a look at the following video tutorial:-