For my last house, I had spent years on smart home automation, I had a binder that contained clear instructions I wrote for everything, and receipts for every upgrade I ever made on the home, warranty docs, QR codes to download smart home apps to control the devices, plot maps, floor plans, a 1-page list of repairmen for everything- you name it. I made short YouTube videos for everything like turning the water on/off…
I own my home & am into automation - but I don't plan on living in this house forever. As such I try to only install things that can be easily reversed when I move out, e.g wireless instead of hardwired smart switches - devices that piggyback on 'normal' home things. Otherwise I'm just giving the next owners thousands of dollars of things they don't want & unnecessary headaches.