The Raspberry Pi Zero 2 W is the perfect way to kickstart a smarter home
It won't do it all, but it will handle the basics.

So you want to start up a smart home, do you? They can be a lot of fun, especially when you really get into the rhythm of setting up devices and getting them on your network. Best of all, because it's all local, you don't need to have your devices broadcasting on the internet if you don't want them to.