Drupal 8 Link code example

Example 1: drupal 8 type link

use Drupal\Core\Url;

$rendable_link = [
  '#type' => 'link',
  '#title' => $this->t('Link title'),
  '#url' => Url::fromRoute('YOUR_ROUTE'),
];

Example 2: drupal 8 HTML in type link

$link = [
  '#type' => 'link',
  '#title' => [
      '#type' => 'inline_template',
      '#template' => '{{ title }} <span class="icon-right-arrow"></span>',
      '#context' => [
        'title' => $title
      ],
  ],
  '#url' => Url::fromRoute('user.pass'),
];