Writing a formal letter involves a clear structure: start with your address and the date, followed by the recipient's address. Begin with a polite greeting like "Dear [Name]." The body should be concise and to the point, ensuring clarity in your message. Lastly, use a formal closing like "Sincerely" or "Yours faithfully." Have you ever had to write a formal letter for something important? What was it about? I'm here to help if you need any specific tips!