What makes someone into a good or great teacher, or a dance course into a good course? Of course, there are many different aspects of this, and some of them depend on why you want to take the course. If you just want to have fun, a stand-up comedian with some basic dance skills might make you a great teacher. But if we assume you really want to learn how to dance well, here are some criteria to help you pick:

This is an excerpt from one of my books - "The Secrets of Social Dance - How to Become a Popular Dancer" which you can find on Amazon.

Do they know the topic?
First of all, does the teacher know the subject? What does it tell you if a teacher offers a dance course but have never really taken a dance course themselves? What about a teacher who learned from youtube? Would you spend your money on someone who hasn’t spent their own money to learn? I am not saying it is impossible to learn on youtube, because there are classes, and there are also some...