Render form in Drupal 8.

**In modulename.routing.yml**
  
modulename.fp:

    path: '/formpage'

    defaults:

    _controller: '\Drupal\modulename\Controller\*Controller::formpage'


**Write code in controller.php**

  public function formpage() {

	$form = '';

	$form = 'Form Title';

	$form .= \Drupal::formBuilder()->getForm('\Drupal\modulename\Form\fp');

    return [

      '#type' => 'markup',

      '#markup' => $form,

    ];

  }

and write form code in modules\modulename\src\Form\fp.php.

but showing
**Form Title** Array

how to render form.