If you will search on the web you will find a lot of resources to learn Tableau but not every certification is good for you. According to my experience, I would suggest to first research, then only take any course, One year ago when I started learning Tableau I researched a lot of websites, and finally, I found Intellipaat who provides the best Tableau certification in the PAN India. Reasons for choosing Intellipaat was as follows:-
The course content is great and the trainers who teach you are having a decent amount of experience more than 10+ years.
The support team at Intellipaat is very supportive, they are available 24*7 to clear all your doubts and these are the facilities you would like to avail.
I am mentioning a video tutorial of Tableau by Intellipaat which is free of cost watch this to clear all your doubts.