I switched over to Actual last month, and am not looking back. I will miss the native android app, but it is an otherwise direct replacement. I was using YNAB4, and had forever.

Easiest to work backwards. Pick out some devices you’re interested in and google “device home assistant”.

You can get a lot of different stuff working with HA with different methods/radios. I use Z-Wave, Zigbee,MQTT, and matter devices.

What radio you have connected to your Home Assistant could be your limiting factor. I have HA on a Raspberry PI and use an Aeotec Z-Stick and Conbee II connected to it. There’s probably better stuff out there now.

Are phone manufacturers running different voltage batteries?