For learning data analysis, there are several free online courses available. But the majority of them fail to meet what learners are looking for. For best online free course I would recommend you to watch the below video -
This video has covered various topics of Selenium Java. Upon completion of watching the video one can have better understanding of Selenium. If you are someone looking for certification along with training then have a look at this Selenium Certification Course offering by Intellipaat. This training help you to become a certified professional with all the required skills.