You have worked hard for what you have, and you don’t want it all to be stolen by some random person breaking into your home. Unfortunately this happens way too often. Every day, thousands of homeowners just like you are getting their belongings stolen, and in many cases, it could have been prevented.
Interestingly enough, a large percentage of burglars enter through the front door, so having a solid core door with a good deadbolt is a wise choice. You should also make sure that there aren’t any windows from which the door could be reached if the pane was smashed.
One of the most efficient deterrents for burglars is an alarm system. If you don’t have the money to install in it, you could get the next best thing and install the signs and stickers that will tell a burglar that there is an alarm system even if there isn’t one.