Effective date of resignation

1. How can I compose an immediate resignation letter?
2. Resigning Health Reasons: Letter & Reference (Guide)
3. What is the conventional business letter format for writing a resignation letter?
4. What is the best way to write a resignation letter with immediate effect?
5. What is the best way to write a resignation letter due to health reasons?
6. Resignation Letters: Business Ownership (Guide)
7. Writing Resignation Letters: Job Security Concerns (Tips)