Have you ever found yourself in a situation where you need a specific HTML structure and to fulfill that structure you need to render blocks, entities, menus... inside that structure? And you couldn't create the structure from the Drupal Twig templates? Here is the solution. I will explain the problem I had a few months ago. I had to create a screen in which I had to display a view with a list of elements and I also had to display a menu. Let me show you the structure that the page should have.