You have a tight budget yet you still want to feel a sense of security in this troubled world.
The first thing you want to do is start with the basics- meaning locks on every door and window in your house.
Never take for granted the fact that the worst cannot possibly to you therefore you must take precautions to prevent it and have some sort of assurance that everything will be okay.
If at all possible you need to get one of those entry-level home security systems if you don't have one setup already.
Usually this involves having a technician come over to your home and setting up some wiring throughout your entire home in strategic places such as your windows and doors and every time they open it will trigger a alarm or silent alarm depending on what features you're looking to get.
In general the system would require you to enter a pass code in order to shut down the alarm before it goes off and wakes up all your neighbors.
As part of your overall home security set up you also want to consider installing a motion detector to light up outside your front door so that it will deter anyone from even a tempting to come near your house.
Speaking of motion detectors you could also set up cameras that will actually go off whenever there is something that triggers a motion alert within a certain radius.