While driving, lock your doors and roll up your windows. Park in a well-lit area and keep all valuables out of sight and in the trunk. While walking, avoid isolated areas. Walk confidently and with another person if possible. Don't carry a lot of cash and avoid wearing anything that would attract unwanted attention like furs or jewelry.
When answering the door, never let in a stranger for any reason. Always ask service people for identification before letting them in your house. You may want to contact the company to verify their identity. Never, ever pick up hitchhikers. Beware of a stranger who approaches you with a " great " business opportunity. If it sounds too good to be true, it usually is. Never leave your keys in your car, for any reason. Never leave your car doors unlocked. If possible, choose a parking lot with an attendant.
Remove any identification from your personal key ring. Be aware of your surroundings - know who's out there and what's going on. Trust your instincts. If a situation or place makes your feel uncomfortable or uneasy, leave.