I am an african-american woman and I have been dain my hair shampoo should I be using and what ingredients should I stay away from to prevent dandruff?

Medicated shampoos. Rather than avoiding certain ingredients, you should try to use medicated shampoos in attempt to control, not cure, your dandruff or "seborrheic dermatitis". I like to recommend selsun blue, neutrogena t-sal or t-gel as well as many of the various head and shoulders products. If these do not work by lathering onto scalp x 5 min at least 3 times per week, see a dermatologist for prescriptions.