CakePHP’s official skeleton app ships with a default controller PagesController.php. This is a simple and optional controller for serving up static content. The home page you see after installation is generated using this controller and the view file templates/Pages/home.php. If you make the view file templates/Pages/about_us.php you can access it using the URL http://example.com/pages/about_us. You are free to modify the Pages Controller to meet your needs.
When you “bake” an app using Composer the Pages Controller is created in your src/Controller/ folder.