Learn how to create a comprehensive login system in PHP from scratch in this extensive tutorial. Explore the fundamentals of PHP, error handling, and MySQLi databases while building a functional login and signup form. Dive into essential topics such as HTML and CSS markup, database setup, PHP signup and login scripts, session management, and dynamic content display based on user authentication. Master the creation of error messages and troubleshoot common issues encountered during development. By the end of this tutorial, gain the skills to implement a secure and robust login system for your web applications.