i highly recommend a good moisturiser, hylauronic acid, viatmin c and sunscreen. thats really all u need at ur age unless u have textured skin and have dark acne scars, then retinol or Tranexamic Acid would do
If u start taking retinol, it should only be applied at night. u need to apply a very thin layer, and only apply once a week for a while to build up a tolerance and then u can do twice a week.
You need to wear sunscreen the next few days if u applied retinol the day before, as u will ruin ur skin.
I highly reccomend la roche-posay products, esp the retinol one as the tube lasts me a year lol.
If you have light acne, then i'd say improve ur skins hydration using hyaluronic acid and use sunscreen everyday. If its real bad acne then u need to go to a dermatologist