Learn to create a secure signup, login, and logout system using PHP and MySQL in this comprehensive tutorial video. Explore best practices for user authentication, including server-side validation, password hashing, and database integration. Master techniques for preventing duplicate email registrations, implementing POST/Redirect/GET pattern, and utilizing sessions for user management. Enhance your web development skills by incorporating client-side validation with JavaScript and AJAX for real-time email verification. Follow along to build a robust user authentication system from scratch, covering everything from HTML form creation to database connectivity and security measures.