Your eyeball is good at figuring out the color of light surrounding you so that white things look white wherever you go. A camera isn’t so smart. White balance is nothing more than you telling the camera what to use as its white point so the image appears the way you want it to.
White balance seems intimidating because it’s measured in “degrees Kelvin” and refers to “black body radiation”. In many situations it can be as simple as leaving your camera on auto white balance (AWB) or shooting raw (if your camera offers it). Shooting raw allows for a safe adjustment of white balance in post. White balance is usually made simple by the presence of little white balance preset icons on your camera. Just pick the one that matches your shooting scenario.
But if you want a little more control, Just remember a few of these basic Kelvin values: