Start with GOV.UK’s “Private renting” and “How to rent” guidance, which cover tenancy agreements, rent, deposits, repairs, safety and ending a tenancy in England. Rules differ across England, Wales, Scotland and Northern Ireland, so use the guidance for the nation where the flat is located. Before signing, check who is responsible for bills and repairs, how your deposit will be protected, and whether any fees or checks apply. If you are unsure about a dispute or notice, contact your local council’s housing team or a regulated housing adviser or solicitor.