Don't put spare keys inside plant boxes or beneath the welcome mat. These seem like great places for you when you misplace your key. Thieves are familiar with these hiding spots. Try having your trustworthy neighbors hold spare keys.
If you do not know the person at your door, don't open it. Folks are always thinking up new schemes to get people to open the door so that they can commit their crimes. You should only open the door to people you were expecting.
Your home is the most important place in the world for your family. It should be a safe place for them to return to after going out. You can find some great advice concerning the safety of your home in this article.