How do I know which section my products should be classified under? As in, services, sales, etc.

Classifying your product and services in QuickBooks Online (QBO) is easy, @hello-inthecorte.

Determining which income account to use depends on how you want to track your sales. You can use any of the pre-created accounts in QBO. If you want to be more specific, you can create a new account. 

You may consider visiting this article to further give you an overview of different income accounts available: Learn about the chart of accounts in QuickBooks. To check them, click the A deeper dive into account types section and select the Income and expense accounts dropdown.

I also suggest reaching out to your accountant to give you advice on what income account you can put your products and services in. This is to ensure that you keep an accurate record of your data and avoid messing up your books. No need to worry if you're not affiliated with one, we have this Find an Accountant tool you can use.

Tracking your sales information is also a breeze. QBO has several reports that you can open. To get started, you can either run Sales by Product/Service Summary or Sales by Product/Service Detail report. 

I'm always around if you need more help classifying your product and services items. Simply click the Reply button to notify me of your response. Have a good one.