How do I track cash sell

Thanks for reaching out, @usersanchezcigar. It's my pleasure to guide you on how to track your transactions. 

You can create an invoice when your customer agrees to pay you later. Aside from that, you can set up terms to indicate how long the customer has to pay.  

For more detailed info, you may review this article for your reference: Record invoices in QuickBooks Online.

On the other hand, a sales receipt is used when your customer pays you on the spot for goods or services. To record the transaction, here's what you need to do:

1. Go to the + New button.
2. Choose Sales receipt.
3. Select the customer from the Customer dropdown.
4. Enter the sales info, such as the payment method.
5. Record line items for the products and services you sold.
6. Once done, click Save and close.

Additionally, I've attached an article you can read through to guide you on how to accept a credit or debit card payment in QuickBooks Online: Process payment. 

On the other hand, you can run through the resources from this material for more tips while running basic reports in our system: Run reports in QuickBooks Online.

Please let me know if you have anymore questions with your sales transactions in QuickBooks. I'm just post away if you need a helping hand.