This lesson introduces how WordPress works with web servers, explaining that WordPress is a web application running on servers typically using the LAMP stack (Linux, Apache, MySQL, PHP) or LEMP stack with Nginx instead of Apache. It details how web servers handle requests, serve files, execute PHP code, interact with the MySQL database, and deliver content to browsers, providing an essential foundation for developing custom WordPress sites, themes, and plugins.
https://learn.wordpress.org/lesson/wordpress-and-web-servers/