As far as doors, every one of mine have two deadbolts one even has three in addition to the regular lockset. The deadbolts are 1\3rd down from the top and 1\3rd up from the bottom. Hinges and strikeplates are secured with 4" screws into the the adjacent studs. My doors are like wooden versions of steel vault doors. In the almost 30 years I have lived here I have never been broken into, which is more than I can say of my neighbors. Just having the appearance of being a hard target to crack is a deterrence and it being a hard target to crack helps also. I am also a realist given enough time any home defense can be defeated, I just hope it makes them look for an easier target. Still I have my guns for backup.