I will go over a step-by-step resignation template letter you can use, how to structure it and provide examples of resignation letters. Learn how to write a professional resignation letter with our step-by-step guide, easy to use templates and helpful tips.In the body of the letter, immediately state your intention to resign and provide your reasoning, including only positive feelings towards your work experience. Second paragraph: You can explain why you're leaving in the second paragraph, but keep it brief and professional. I want to assure you of my gratitude for a rewarding professional association during my tenure with ABC Company. All of this would be aimed at getting a real resignation letter with a definite date of resignation two weeks or less in the future.