How do I programmatically create a page in drupal 8?

// src/Controller/ModulenameController.php
 
namespace Drupal\modulename\Controller;
 
use Drupal\Core\Controller\ControllerBase;
 
class ModulenameController extends ControllerBase {
  public function helloWorld() {
    return [
      '#markup' => 'Hello, World!',
    ];
  }
}

# modulename.routing.yml
 
modulename.hello_world:
  path: '/hello/world'
  defaults:
    _controller: '\Drupal\modulename\Controller\ModulenameController::helloWorld'
    _title: 'Hello, World!'
  requirements:
    _permission: 'access content'

Or using drush:

# vendor/bin/drush generate controller

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