After creating a new Symfony application, you can use the server:run
command to start a simple PHP web server, so you can access your new application from your web browser:
cd my_project_name/
php bin/console server:run
You can now visit http://localhost:8000/ to see the Symfony welcome page.
Important: while using the built-in web server is great for development, you should not use it in production. Use a full-featured web server such as Apache or Nginx instead.