When you first started your business, you might have been able to keep track of your merchandise by counting manually. However, as you and your product list grew, this became impractical.
QuickBooks Online has a much better way. Whether you sell products, services or both, you need records of specific items to use in transactions and reports. Those records are especially important if you have physical inventory, and they can store details that help you know, for example, when it's time to reorder.