The wise choice to help the stock management process and make online shopping more professional is to get additional stock for your products. Every product in your store has a stock setup option. The stock is set up so that customers can immediately determine whether a product is available without having to ask the retailer. "In Stock" and "Out of Stock" will designate this availability on the storefront.  The following procedures should be followed to setup stock in Magento 2:  On the Admin panel select ,Stores > Settings > Configuration.  Select the Catalog> Inventory on the left-hand panel.  In the Stock options;  Select Yes in the ‘Set Items' Status to be In Stock When Order is Cancelled’ when the order gets postponed and the product is returned.  Set ‘Decrease Stock When Order is Placed’ to Yes whenever there is increase or decrease in the product's amount in the shopping cart.  If you agree to include the product in the catalog even though it is out of stock, then select Yes for ‘Display Out of Stock Products’.