Choose your foundation formula based on your skin type and the coverage and finish you want; the dryer your skin, the richer and more emollient your foundation should be. Oilier skin types should go for hydrating and oil-free foundations.
Apply foundation where your skin tends to be the most uneven. Focus on redness and unevenness around the nose and mouth, and on the chin. Use your fingers for sheer coverage, a brush for medium coverage or a sponge for medium to full coverage.
Customize your coverage by layering two foundation formulas. Start with a liquid foundation for coverage all over the face. If you see any redness or unevenness showing through in certain areas, go back and spot-apply a cream foundation using a foundation brush.