Explain why you're leaving. Briefly explain the reasons you've decided to leave, both related to your current job and to your new position.A good resignation letter is a simple one. There is no real need to elaborate farther than you have to. Please accept this message as my formal notice of resignation. I am fortunate to have received a long awaited opportunity that I cannot pass up. Learn how to write a short notice resignation letter with this stepbystep guide, template and examples of formal resignation. Here's how to write a resignation letter when you're quitting for a job with a better compensation package, and you want to provide your employer with a reason. Pick the perfect wording and convey the message best suited for your situation. Use a one week's notice letter template to inform your current employer that you plan to resign within seven days.