what kind modern dance
Taking ballet class in addition to your other techniques will always give you a good base line of overall dance technique. Ballet is linear; emphasizing form, extension, and lightness in the body. This can clearly translate well into certain styles of jazz dance and modern dance (such as Horton or Graham Technique). However, other styles of dance, such as release technique, hip-hop, and others, will require you to throw out all of that ballet technique.