Installing Locks
The use of deadbolt locks makes it harder for a burglar to force his way in. A full-service security system will deter him even further.
Although neither can be guaranteed to protect your home completely, the more difficult it is for a burglar to enter, and the more obstacles he encounters, the less likely that he will be willing to put forth the effort to follow through with the burglary.
-- Tips courtesy of HomeAdvisor.com