how do I buy apple homekit

Hello klcharlton61,

Apple HomeKit is not anything you need to buy. It's something integrated into specific smart home devices that work with the Apple Home App, which comes pre-installed on your iPhone.

Here's some more information about the Home App from Apple: Home app - Apple

Here's a list of HomeKit enabled accessories: Home app - Accessories - Apple

Once you buy a HomeKit enabled accessory, you can use the steps in this Apple Support article to help set it up in the Home App: Add an accessory to the Home app - Apple Support

Good luck!

-Dallen