Hello, gradient. It's my pleasure to have you join our forum. The Community is always here to provide the assistance you require to address your concern.
There are two ways to record the rent depending on how you receive the payment. If you expect to get paid later, you can create and send them an invoice; if you receive the money immediately, you can generate a sales receipt. Before doing so, you need to make a customer, account, and item in your QuickBooks Online so you can add them to the transactions you'll be making to track the rent.
To record an invoice:
Click + New, then select Invoice.
Choose the customer.
Fill out the necessary details, then Save and close.
If there is anything else you need help with any QuickBooks-related concerns, feel free to get back to us. You can reach out by posting in our Community forum again. Take care, gradient.