Hi MATTEO COM,
Welcome to the Community. It's essential to correctly record your transactions to keep track of your books. QuickBooks Desktop is a great program that gives you the ability to easily track your sales and expenses. I'd be glad to help.
Based on what you've described, I feel you'd benefit more from contacting our support team outside of the community. They'll be able to point you in the right direction to keep your books balanced. You can review this article to contact our support team.
Let me know if you have questions, I'll be happy to help.