The terms worth writing down, who signs what, and why a tenancy is better for being on paper.
A tenancy that is only spoken depends on two people remembering the same thing a year later. An agreement is how an owner and a tenant say what they have agreed, so that a disagreement about the deposit, the notice or the repairs can be settled by reading and not by arguing.
Many states require a tenancy of more than a certain length to be registered or stamped, and the rules about who pays and how much differ. An unregistered agreement may be treated as weaker if there is ever a dispute. Ask a local lawyer or the registration office what applies where the home is.
Both sides should hold a signed copy, with the photographs or inventory of the home's condition on the day the tenancy began. Pay rent by a method that leaves a record, and keep the receipts.
This guide is general information, not legal, tax or financial advice. Rules differ between states and change over time, so confirm the details that matter to you with a qualified professional or the authority concerned before you act.