You can choose what notifications you receive and how advanced you want them to be.  To set up inventory tracking notifications, go to the Products section in the back-end of your Shopify store. Click the name of the product and variants that you want to track. In your Notifications settings, you can view and update what notifications you receive.  You can also set up inventory notifications in the Shopify Fulfillment Network (SFN) app. This will estimate how many days until a product will sell out and notify you accordingly. You can choose the number of days' notice you want to receive before the inventory sells out in your store locations.