How to get the front page title in page.html.twig?
You should really try using the blocks for this, but here's how to do what you asked:

function YOUR_THEME_preprocess_page(&amp;$variables) {
  $request = \Drupal::request();
  $route_match = \Drupal::routeMatch();
  $page_title = \Drupal::service('title_resolver')-&gt;getTitle($request, $route_match-&gt;getRouteObject());
  $variables['current_page_title'] = $page_title;
}


This code should go in YOUR_THEME.theme file. You can use it then in page.html.twig this way:

{{ current_page_title }}


See this for more information.