1. Use a Gray Card >Read more about how to use one here< You can also use an expodisc, which I’ve more recently spent more time with and love. It’s easy and much quicker!
2. Consider how important white balance is to photography and take the time to learn it. I promise you it may seem daunting, but it’s not actually as difficult as you might think. I think sometimes people underestimate how great a photo looks in its true color compared to the yellow, magenta, or cyan color casts that can be caused by artificial (and sometimes even natural) light. I have a recorded webinar (class) all about white balance and the different types you can use >here<.
3. Light is always changing and it’s easiest to get your settings right in camera than to spend hours later in Photoshop trying to correct color casts.
4. Use your custom white balance setting instead of auto. Shooting with auto white balance is like shooting with your camera in auto. You have far less control over the situation and using custom white balance will allow you to get the exact look you want to achieve.
5. Some of you might be going…wait, what? White balance is the setting on your camera that keeps your colors true. It makes your whites white instead of appearing to have different color tones.