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.Learn how to write a professional resignation letter with our step-by-step guide, easy to use templates and helpful tips. Learn how to write a short notice resignation letter with this stepbystep guide, template and examples of formal resignation. Simple resignation letter and email message samples to use to quit a job, as well as tips for what to write and how to resign. 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.