Magento is a powerful eCommerce platform. It has many features including basic Inventory control. Here is what comes by default:     Stock level is decreased every time a purchase is made. Stock level is increased every time a return is processed. You can receive low stock reports. An item goes out of stock when the level reaches a threshold. An item becomes in stock when the level goes above a threshold.   All of the above actions are performed automatically. So as long as you are a small shop owner, Magento can handle your inventory out of the box.   Problems start when you have more than one warehouse. You...