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Your complexion is the shade of your skin and can change from sun exposure or skin conditions. You always want to try a foundation on to make sure it matches your complexion. Standing in natural light, swipe potential foundations across your cheek or near your jawline. The right foundation will disappear, blending perfectly with your skin.  If you can't find a foundation that matches, try choosing the shades that are closest (one slightly darker, one slightly lighter), and mixing them to make a perfect match.  You can also buy the lighter foundation and add a bronzing powder later to warm it up. Your type of skin can influence which foundation is right for you. Stick foundations may be made for all skin types (check the labeling), but for the most part they're best for oily or combination skin. If you don't know whether your skin is dry, oily, normal, or combination, wash your face with a gentle cleanser and notice how your skin feels after 15-20 minutes.  If your face feels moist or oily, your skin is oily. If your skin feels tight, tingly, or dry, you have dry skin. If your skin feels soft and clean, you have normal skin. If your skin feels oily in your T-zone (your forehead and nose), then you have combination skin.
Find a foundation that matches your complexion. Figure out your skin type.