Protection for the home is a fundamental magical working that just about everyone should do. Of course, these aren't replacements for common-sense things like locking your doors and getting a house alarm if needed, but they certainly support those mundane solutions.
A very simple way to protect the home is to anoint the doors and windows one of the oils below in a five-spot pattern. (Like a Pentagram.) Put a little oil on your fingers, touch each corner of the door and the middle while praying Psalm 23 or praying in your own words. This will literally drive your enemies away from your home and reflect anything they throw at you back with a vengeance.
These are just a few simple ideas, and there are many more out there.