Google "how to install home assistant" which leads to:
>https://www.home-assistant.io/installation/
>If you are unsure of what to choose, follow the Raspberry Pi guide to install Home Assistant Operating System.
This leads to:
>https://www.home-assistant.io/installation/raspberrypi
This has a nice visual guide that requires you to know how to buy a raspberry pi, how to plug in a raspberry p, how to plug in an sd card (twice), and how to navigate to a url.