I enjoy dancing but am not very good at it. Do you dance?
I do not dance, however I know a few dancers. One is actually on the Duke University dance team
Thats awesome, what kind of dance do they do?
They split their time between performance art and cheerleading
Okay.. How many different dancing genres or forms are there?
Almost too many to count. Theatrical, ballet, and cultural-based dances are some examples.Other activities such as martial arts and figure skating have body movements similar to dancing. 
Whats the most popular form then do you think is in your opinion?
I would say ballet. Most dancers begin with ballet, and it appears to me to be the most popular.