I want to make a report that shows me how much money I collected from all my customers monthly or for a specific period of time

Hey there, @odeon motors.

Let me help you view these transactions in QuickBooks.

You can run the Invoices and Received Payments report in QuickBooks Online. This will show the payments you’ve received and the invoices that go with them. Here's how to open the report:

1. Go to Reports and search for the Invoices and Received Payments report.
2. Click the report to open, then filter its dates according to the data you needed.
3. Select Run report.

As financial reports in QuickBooks give you tons of great info about your business. You can customise them to show specific accounts or customers, or format the layout so the right data shows up in the right place. 

Let me know how else I can help you with QuickBooks by adding a comment below. I'm more than happy to lend a helping hand. Keep safe!