For people with oilier skin, the main thing to focus on is finding products that can control excess sebum production while adding moisture (without leaving behind a heavy, greasy feeling). Look for products with niacinamide, also known as vitamin B3 or nicotinamide, which is a buzzy star ingredient that does all of these things. It has become known for its moisturising and hydrating properties, as well as its ability to minimize the appearance of pores and decrease oil production.
If this is one of your primary skin concerns, The Inkey List Niacinamide Oil Control Serum (£10) is a good product to check out.