Hello there, Keuma.
If you have set up the tenants as customers, then you can record the rent income as invoices (if you receive payments at a later date) or sales receipt (if you receive their payments right away).
I've got an article here that you can use for reference: Record transactions for a property management company.
I'd still recommend consulting your accountant to ensure the accuracy of your financial reports.
Please don't hesitate to reach out to me if you have any other questions or concerns. Thanks.