You need to understand the layout of the Nest Hub (including Nest Hub 2nd Gen and Google Hoem Hub) to use the smart display effectively.
This Google Home guide explains the layout of Nest Hub, the function and usage of each part of the smart display to help you get started quickly with your Google Nest Hub.
Because the layout of Nest Hub, Nest Hub 2nd Gen, and Google Home Hub is identical, this guide applies to all of these 3 Google smart display devices.
Why do you need to know the layout of Nest Hub?
Although you interact with Google Home Hub, Google Nest Hub, and Nest Hub 2nd Gen mainly through voice commands (Google Assistant) and the touchscreen, you may still need to use some buttons, for example, to mute the microphone, to reset Nest Hub.
Also, if you know the location of the sensors, you may have a better understanding of some issues you may encounter due to blocked sensors.
Anyway, a smart display can work for you for at least a few years. You should spend a few minutes understanding the layout of Nest Hub. It will pay off soon.