There's some good advice in here. One thing to remember is that things like locks and deadbolts only slow an intruder and do NOT completely stop forced entry. I have a lot of experience with breaching and forced entry, as well as physical security measures to deter entry or theft. Lighting is a huge deterrent. Other than the basics already mentioned, be able to deter long enough to identify that forced entry is occurring so you can put a few holes in the son of a ^}%[+. If someone wants in, they are getting in. I have made sure through possession of firearms (and lots of training) if someone comes into my home unwanted they better bring their f-ing "A" Game. Sorry to ramble on, but there are so many variables here. Complacency is huge too. For all those that have alarms, so many forget to arm, close garage doors, lock doors after letting pets out, etc... Something to think about!