Start with Citizens Advice or Shelter, which offer practical guidance on deposits, repairs, rent arrears and eviction notices. Your local council’s housing team may be able to help with serious hazards, unlawful eviction concerns or homelessness risk; use GOV.UK to find the right service, noting that housing rules differ across the UK. If you have received court papers or an eviction notice, seek advice promptly from a housing solicitor or advice service, and check whether legal aid may be available. Keep copies of your tenancy agreement, messages, payment records and any notices.