Once you've created collection, you can choose to showcase selected products on your webstore's landing page based on their grouping (collection).
Go to your dashboard > scroll to Webstore > click on Settings > scroll down to Home Page Product Display.
Select Collections and you can choose the products that according to the labels that you want to display.
Once saved, a notification panel will appear on top of your Dashboard.
These changes will be reflected in your Webstore. Each collection will showcase up to four products of the selected collection.