Nowadays with the latest technologies, digital cameras are smart enough to do everything automatically for you. What you have to do is just point at your target and press the button.
Having said that, the best cameras also have problems adjusting the auto white balance when shooting in certain conditions. For instance, indoor shots may appear too yellow due to the type of lights or the leaves on trees may appear less green on a cloudy day.
Give manual white balance a try if you want more accurate colours from your powerful camera.