If you have long enough hair that it touches your face and you're constantly rearranging it, stop. You'll break out in areas where your hands touch your face.

Diet and exercise help everything, truth.

Wash your sheets regularly, and your computer chair (if you're one to sit shirtless [meee] in front of your computer, leaning back. Or just wear clean shirts everyday (should be obvious.) Things that come in contact with your body on a continual basis should be as clean as possible, and changed regularly.

Stress will break you out, even if it's minor~

Washing your face with a gentle soap (don't scrub and irritate your skin) 2~3x a day removes surface oil and what little dead skin and FILTH you may encounter. People with drier skin types should cleanse less frequently.