When people think about home security system they think of a service that they're going to have to pay a large company to come out and install and on top of that pay a ridiculous monthly fee for home security. But this type of system is not your only option.
There are basically two types of security systems, a hardwire system and a wireless system. If you want a hardwire system like the good old days then you most likely will want to contact your local home security company or wait until they knock on your door. These hardwire home security systems are what are normally installed in stores and other businesses but may not be the best option for you. These systems are also much more expensive compared to the wireless system.
The wireless system is simple enough that you should be able to install it yourself in your home to bring an added measure of safety to your family. Our society isn't getting any better anytime quick so like your mother I'm sure always said, better safe than sorry. Every household should have some type of home security system.
As you begin your installation of your home security wireless system you first need to decide where you want to place the control panel. Most people place the panel in a hallway near the main entrance of the home. This will allow easy access as you enter and as you leave your home. Then you need to decide where to place your motion sensors. It's recommended to but your PIR movement sensors in high traffic areas in your home like near the front and back door, or the door leading to the garage. These should be your first priority when setting up your motion detectors. Then if you have more detectors place them in the main rooms and especially the ones that have easy access from the outside.
Next, you want to make sure your outside doors and maybe even some windows have contact sensors. There are two types of door contact sensors - delayed and immediate. You will probably want a delayed sensor at your main entrance which allows a short period of time for you to reach the control panel and disarm the home security system. On your other doors and entrances you may want an immediate contact sensor so the alarm will sound as soon as the contact is broken.