Google Assistant voice commands for your smarthome work best if your devices are in groups (Google calls these groups "rooms"). Skipping this step during installation will make your devices get harder. Here's how to create rooms and add devices to them.
Room makes voice commands easier
With your smarthome devices associated with rooms, Google will let you do more in fewer words. Rather than telling "turn off the living room light 1, turn off the living room light 2, turn off the living room light 3" and so on, you name the room's living room and then say "turn off the living room light" to turn everything immediately.
Even better, if the Google home you're talking to is physically in the same place as your smart lights, then you can add it to the same group as the lights. Then all you have to say "turn off the lights" – Google Assistant understands the association and turns off the right light.
How to add new devices to rooms
To add a device to a room, open Google Assistant and click the Add button.
Click on the "Set Up Device" option.
Touch "New Device" for all Google Home or Chrome Cast devices, or tap "Has something already configured?" for external devices such as Philips Hue or Wink hub. For this example, we use the latter option.
In the Manage Accounts dialog box, either scroll to the service to add or tap the magnifying glass to write the name and search for it, for it Here we write Magic Home.
Press Service, then enter account details. If this process seems to hang, try tapping the three points in the upper right corner and opening it in the browser instead.
 Touch the found devices, and then tap the "Add a Room" option.
Touch the appropriate room name, then press "Next". If necessary, scroll to the bottom, where you will see a "Custom Room" option that lets you create a name.
You are completely ready. Your device will now be connected to a room.
How to add existing devices to rooms
Open the Google Assistant app and scroll down to find a list of devices that are not in the rooms. Tap any device to add it to a room.
Click "Add to a room" at the bottom of the screen.
Select the appropriate home location. You will probably only have one home, so tap it and then press the "Next" button.
Next, press "Move device."
If you have more than one account with your "home" (for families, etc.) they all have access to the unit. If you ever move the device to a new home, all members will lose that access. Google is trying to make it clear with the message "Affecting Home Members". It is something to remember with a family set.
Touch the room you want to connect to the device, and then press "Next".
If you don't see a badge you like, scroll to the bottom of the room selection. Touch the "Custom Room" option, enter a label you want, and then press "Next."
If you have a Google Home device, add it to the same room so you can easily check their lights. When a Google home is associated with the same room as smart lights, you can say, "Hello Google, Turn on the lights" to turn them on. This, of course, just makes sense if the lights and the Google home are physically located in the same room.
Grouping your units into rooms means you can control these rooms by referring to them. If you have grouped units in a room labeled "bedroom" you can say "Hello Google, turn off the bedroom" or "turn off the bedroom light" even when the Google home is somewhere else in the house.
Keeping devices grouped In the rooms, not only your Google Assistant app will be better organized but it will be easier to work with these devices. If you have three candles in a room, it is much easier to say "Shut down the living room" than having to tell to turn off each light in turn.