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.Dear (Supervisor's Name),. It typically includes the date of resignation, a brief explanation for leaving, and an expression of gratitude towards the employer for the opportunity given. Use one of our resignation letter templates. You can pick a few classy reasons here. 1. Say you received a better opportunity for growth and position elsewhere. 2. For instance, some organisations require two weeks' notice, others require four or more. Note your last working day. 5. A simple resignation letter format includes a resignation statement, an appropriate notice period, and an expression of gratitude.