Drupal - Redirect after form submission

In your "submitForm" method write below code

 $form_state->setRedirect('machine_name');
 return;

where machine_name is the machine name mentioned in the routing file.

I hope this helps .. :)

If you want to set at buildform you need to use some routing path like.

use Drupal\Core\Url;

$url = Url::fromRoute('route.path');
$form_state->setRedirectUrl($url);

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