4) Don't touch your face: You touch your face more than you know. The National Health Institute of Bethesda found that people touched common objects an average of 3.3 times per hour and their faces 3.6 times per hour. If you get bacteria on your hands and then touch your face... the bacteria is now on your face. And bacteria causes imperfections.
Touching your face is a harder thing to stop doing than you think, as it happens naturally. How often do you move your hair out of your face? How often do your rub your eyes, or hold your hand up to your face when you sneeze? But the pro tip here is to make a concerted effort to not touch your face and use anti-bacterial gel or wipes to kill all the nasties.