I am fair-skinned so I don't stay out in the sun unprotected for long periods of time. I also always wash and moisturize my face before going to sleep. This, along with lots of fruit and green veggie juice really helps my skin stay healthy.
Most importantly is nourishing yourself with the right foods for your body and staying hydrating. Though my best skincare tip is to use coconut oil- just a dab on any blemish at night. Seems counter intuitive with the oil but the antimicrobial, antifungal, antibacterial properties do wonders. I also consume coconut oil daily.
I have sensitive skin and found my skin was very aggravated by sodium lauryl sulfate, one of the main ingredients used in foaming bath products (soap, shampoo, bubble bath). I love taking long baths, and started adding some coconut oil to the water (about 2 teaspons) instead of bubble bath. While I don't have bubbles to play with anymore, I get out of the tub with a light coating of the oil all over, leaving my skin feeling wonderful to the touch and generally feeling soothed.
Having naturally oily skin, I used to think that oil was my enemy, and that alcohol-based toners and harsh anti-acne creams were the way to keep my skin clear. Over the years, I've realized that oil is in fact my skin's best friend! I treat my skin so much more gently than I did as a teenager, and I regularly give myself facials (and ones from the spa when I can afford it!) using only natural, organic, non-toxic ingredients. I ensure that my facial products and makeup are top rated on the Environmental Working Group's Skin Deep database. I also wear sunscreen every day on my face and neck--something else I didn't do as a teenager (I'm a huge fan of SanRe's sunscreens).