#5. Make White Things White
The left picture's white balance is too warm, rendering an orange/red tint. The right side is the corrected WB
Without getting too technical, white balance has to do with the tone of your photo. You've seen those shots that look like they have an orange or blue tint. That's a white balance problem. Most cameras come from the factory set on auto white balance (AWB). Sometimes it works, sometimes not so much. So, if the tone (not exposure) of your shots is off, adjust the white balance to make the whites in the photo white.