Start with outcomes
Lighting, comfort, leak alerts, accessibility or energy visibility are clearer goals than 'make the house smart.'
Choose an ecosystem strategy
Apple Home, Google Home, Alexa and manufacturer apps differ, and Matter can reduce—but not erase—those differences.
Map the network layer
Wi-Fi, Thread and bridged technologies such as Zigbee can coexist, but each has different infrastructure needs.
Plan failure behaviour
Decide which functions need manual controls or local operation when an app, cloud service or Internet connection fails.
Keep in mind. Compatibility is not permanent. Confirm the current manufacturer, platform and certification information before purchasing, resetting or migrating a device.