Or install double cylinder, deadbolt locks that need to be opened with a key from the inside as well as the outside. Door hinges should always be on the inside and designed so that hinge pin cannot be removed from the outside. Never hide keys outside, such as under a bush or in a flower pot. It's much better to leave a key with a trusted neighbor. Secure sliding glass doors with commercially available bars or locks, or put a wooden dowel or broom handle in the door track.
Burglars look for sliding glass doors because they are the easiest to open.
Secure roof openings and exhaust systems. Make sure windows, especially those at ground level, have good locks-and always use the locks you have. The center thumb-turn locks on many standard windows can be easily pried open or reached through a broken pane. Shrubbery and Lighting Make sure all porches and other possible entrances are well lit, with at least 40-watt bulbs. A well-lit house is far better protected than a house without lights.