In Tableau, Sets could be defined as something, that is used to create subsets of data that is based on user definitions of certain conditions. And these Sets could only be created based on the dimension fields. If you wish to master Tableau, then check out the Tableau course from Intellipaat. This course offers one of the best instructor-led training courses with guided projects that will help you to get practically skilled with the software. If you want to know more about Tableau, then check out the Tableau for Beginners video.