Identify your skin undertone: cool, warm, neutral, or olive
Test foundation on your jawline, not your hand
Check the shade in natural daylight
Match the foundation to your neck and chest
Choose a shade that disappears into your skin
Test a few shades side by side
Wait a few minutes to see if the shade oxidizes
Consider your skin type when choosing the formula
Pick a lighter shade if you are between two shades for brightening
Pick a deeper shade if your skin tans easily
Use sample sizes or testers before buying full size
Adjust with concealer or bronzer if needed