Let me help you out, Sychan.
You can make use of the Product name and Description for invoices and reports. Although, you can also use the Categories function. It helps you organize the items and services and gives you insights into your sales and inventory when you run the reports.
For starters, I'll share some helpful articles that can better guide you with setting up your products:
If you have additional questions, please feel free to leave a comment below. We'll reply as soon as we can.