What's the best way to apply liquid foundation?

The best way to apply liquid foundation is largely subjective. Some people prefer to apply their foundation with their fingertips, while others find better success with a foundation brush or makeup sponge. Generally speaking, most makeup artists recommend the latter, both because of the smooth, even results, and the simple fact that brushes and sponges tend to be more hygienic (so long as you clean your brushes, that is).

How do I know what my undertone is?

The goal of liquid foundation (and any foundation for that matter) is to create an even, natural-looking complexion. As such, it's important to pick a foundation that matches your undertones. If you have a warm complexion, go with a shade that has yellow undertones, and if your complexion is on the cool side, a foundation with pink undertones is your best bet, InStylereports. To determine your undertones, simply look at the inside of your wrist. If your veins look green, you likely have warm...

How can I prevent liquid foundation from caking?