QuickBooks Online doesn't require deep knowledge of accounting principles. Still, there are concepts you should understand.
Do you know about all of QuickBooks Online's settings? What you're missing may be important.
If you frequently sell multiple inventory items grouped together, you need to learn about QuickBooks' assemblies.
Does your business do work for clients over weeks or months? Consider using QuickBooks Online's progress invoicing.
The data in your QuickBooks company file contains some of the most sensitive information on your computer. Make sure it's secure.