Number 1 tip ALWAYS use sun protection. The sun damages your skin even in the few minutes here and there. Always use a physical sun protection avoid chemical based! Look for the ingredient zinc oxide.
Serum- like a Retinol aka vitamin A. Never too young to start anti aging! Smooths and brightness the skin.
Exfoliate at least once a week
Look for botanical based but active ingredients. There is a huge difference in products you buy at supermarkets or chemist compared to a recommended cosmedic at at skin clinic or salon. And that's not just the price point!