If you have a normal skin type,your skin can tolerate most ingredients and frictionwithout overreacting. It takes a lot to cause your skin to become red, irritated, or inflamed. You typically can use most skin products without worrying about having a reaction. Normal skin types can also be combination, oily, or dry.
If you have combination skin type, the above still applies and you typically become oily in your t-zone (forehead, eyelids, nose, chin), while remaining dry on your cheeks.