Start by looking at what actually harms people where you live, not what feels scary. In most places the big everyday risks are road traffic, air quality, food and water safety, mosquito or tick borne illness in some climates, and lifestyle factors like inactivity. A quick read of local public health advice, plus honest conversations with neighbours or colleagues, tells you which of these apply to your area.
Prevention is mostly unglamorous. Keep vaccinations current for your region, use filtered or bottled water where tap water is unsafe, take road safety seriously as pedestrian and driver, and use repellent and screens where mosquito borne diseases exist. Get a local doctor before you need one and do a basic checkup after moving, since stress and diet changes take a toll.
The practical test for any measure is whether you will actually sustain it. A simple habit you keep beats an elaborate plan you abandon in a month.