I’m a nurse. I work in a Dermatology office full time. I also sell shampoo/skincare. It all just goes together. The company I am doing my side gig with has certifications courses/education about the products, how to use them, in what order to use them, and for what hair and skin type each product is for. The courses have an end quiz that we have to pass with 100% otherwise you have to repeat the entire course. From the very beginning.