Security means keeping the bad guys out
Security isn't about paranoia. It's only a little about defense. Under some conditions, it may be more about letting the good guys in than about keeping the bad guys out.
The primary principle of security for a house should always be that you control it; it should never be that it controls you. It can be as simple as locking the doors and windows .
(We're cheating a little; we already know that this is a residence that does have doors and windows. Some don't).
Physical security concerns address the effectiveness of those locks. A closed door with a worthless lock is no better than an open door. The same is true for a closed door that isn't locked.
It's amazingly easy to add additional barriers to entry, but those tend to be as big an inconvenience to occupants as they are to the bad guys. We don't see any role for barbed wire, moats with drawbridges or death traps (though if we did, we might not publish it here).
Psychological barriers have some effect; consider the “Beware of Dog” sign; it may be a short-term deterrent but in the longer term, unless there really is a dog around, its effectiveness will erode.
There's electronic security to consider, of course.
Operational security - meaning, in short, keeping things going - also deserves attention. If the electricity, for example, fails, the house is out of power and can't pump water from the well.
So one principle of security is that it should only inconvenience the bad guys, never the good guys.
One is that backups or failsafes need to be part of the plan.
And a big one is: don't overdo it.
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