Hi reader, you are not alone in finding it confusing to apply skin care layers correctly, but a general guide can make it easier:
After using your skin cleanser, gently rinse off and pat dry. Apply the serum product first and allow to soak into the skin for a few minutes. Then apply either your primer or your main moisturizer cream to the face and your eye cream to the delicate areas around the eyes. After that, you can apply your specialized spot treatment cream and then cover the whole area with a broad spectrum sunscreen before applying makeup. Sunscreen should be reapplied later in the day again.