While there are no official rules in the world of makeup, we think it’s safe to say that a good base is the key to making your whole look work. An improper foundation application can lead to an uneven and cakey result, and the wrong shade match can totally throw off the final look. To help ensure a seamless finish, start by finding the right foundation formula for you. To help steer you in the right direction, we asked makeup artist Emily Oliver for her foundation shopping tips. Keep reading to learn how to find the perfect foundation fit for you. Plus, we’re sharing some of our favorite, editor-approved foundation formulas.