Make sure to get some that mimic battery power loss at the end. Some models just shut off when they are empty and others slowly reduce the voltage so that battery indicators on devices are able to pick that and display a warning to change batteries soon.
I would love to have an overview before I install an app what it might cost. Play store lists at least minimum and maximum in-app-purchases, but the information is not very visible and I cannot filter my results based on it. And if need to pay for a subscription on the app website it will not be reflected at all.
Developers should be forced to provide an outline what you get for free (if they decide to advertise/sell their app as free) and what the different payment/subscription tiers include.
Of all places Microsoft Windows Store does it quite well for some apps (like MS Office), but also does not enforce it for all apps.
The easiest thing: We use a motion sensor to automatically turn on the light for the stairs. You wouldn’t need Home Assistant for that, but with a little more configuration you can adjust the light levels and colour temperature based on the time of day (not as disturbing at night). We have two rooms which have problems with humidity in one a fan is automatically turned on (basic) in the other a dehumidifier is triggered based on the outside and inside temperature because there are large windows which are producing a lot of condensation otherwise. Now the really specific stuff: My daughter has Diabetes and we need to manage her blood glucose levels. There are alarms but ideally you would act before they are triggered. So we hooked her blood glucose levels to a light in our bedroom which turns on if her levels are getting out of bounds at night. That way she isn’t woken by the alarm, but by one of us and can go back to sleep much quicker.
That’s easily Home Assistant. It got me into the whole home automation stuff and I have gradually included more and more parts into it - including some health related stuff. It really makes my family’s life easier and helps us organizing it.
But it also means that 2025 most likely will not get patches anymore.