Get a dog. Any dog, just as long it barks when it hears strange noises. Burglars do not like dogs, not because they attack, but because they make noise. Put up beware the dog signs even if you do not have one.
Look into a burglar alarm system. It may be a simple system or an elaborate one. Check with law enforcement agencies or security companies to find an alarms they best suits your needs and budget. Many home insurance companies offer discounts for having an alarm installed.
If you have an alarm system, put up alarm warning signs. If you do not have an alarm, put up the signs anyway. Burglars do not know you are lying.
Many police departments have house watch programs, it they do, notify them so they may make periodic patrols by your home.
Setup and participate in neighborhood watch programs. Nosey neighbors may seem like a nuisance but they may also be an asset. Be a good neighbor and report any suspicious activity. Have a trustworthy neighbor keep an eye on your home while you are gone for long periods.
Do not cancel deliveries, since it will look suspicious; have neighbors picks up mail, newspapers, and deliveries.
Put a radio on a timer so it is on during normal waking hours. Tune it to a talk station so there is the sound of voices in the house.
Put the telephone ringer on low volume so burglars will not hear unanswered calls.
Keep expensive jewelry, other valuables, and important documents in a safe deposit box.
Light exterior entrances at all times, not just when not home. Put a couple of interior lights on timers so they are on during normal hours. Have at least one interior light on a timer, not just one by a window. Install motion-sensitive lights in key exterior areas.
Keep a detailed inventory of all household items, including serial numbers. If an item does not have a serial number, engrave one on it. Your initials and last four digits of social security number make an easy to remember serial number. Leave a copy of the inventory with your insurance agent or relatives. Make photos or videos of the entire house and its contents.