Good lighting around and inside your home is a major crime deterrent. Unless you live far away from civilization, the brighter your property is at night, the less chance there is that a robber would want to risk breaking into your home.
Also, give some thought to how your home and activity look from the outside. Does it look occupied? Do you have someone stay there while you’re away for a long time? What does your social networking account say about where you are right now?