Fire extinguisher. One for the kitchen, one for the garage, both rated for oil & grease fires, and with metal not plastic valves (don't buy the cheapest model). Do not store them next to the things mostly likely to catch fire (e.g. the stove). Read the directions, know how to use it before you need it.

Check all the smoke and carbon monoxide detectors. Push the test button. If they're more than 10 years old replace them.

Make a first aid kit

Get a big, high brightness flashlight and/or lantern that will be useful if/when the power goes out, preferably one that takes standard batteries. Rechargeables are great for regular use items to reduce waste, but you don't want to realize that you forgot to charge your emergency light when you suddenly need it and there's no power. Get spare batteries.

You should also learn what easements are on your property, and where your utilities connect to public services - electrical, communications, water, sewage, roads/access paths - where does your responsibility end and the utility company/government's responsibility begin?