It really depends on where you live. I live in a rural area on a gravel road with only one way in and out. I have two dogs that sleep on the front porch. Both

It really depends on where you live. I live in a rural area on a gravel road with only one way in and out. I have two dogs that sleep on the front porch. Both of my nearest neighbors have a dog too. We all listen for them barking and it's easy to tell the difference between them barking at a stranger and howling out to neighbor dogs and coyotes. If I lived in an urban area where stuff getting stolen was a problem I would get good deadbolt locks for the doors and keep the windows locked. I'd also get a camera for the front door and maybe a couple others if needed to surveil and record points of access, and that's about it. I'd probably make them myself out of Raspberry Pi computers and their camera and have fun twiddling with them. I'm not a big fan of loud alarms. There were a few times when I lived in LA that I wanted to smack the snot of owners of cars with those installed when they went off. I haven't heard one of those since I left there.