Walk around your home with the eyes of a burglar. Look for weaknesses–sliding glass doors that could be jimmied off the track, glass that could be broken to gain entry, window unit air conditioners that could be easily removed, and so forth. A committed burglar can usually find a way into a house, but you can make it more difficult for them, and this starts with knowing your property and potential entry points for a break-in. Take a walk around the outside as well and note what pricey items are in view, tempting would-be burglars.