Simplify Menu

The simplify_menu module uses a TwigExtension to gain access to Drupal's main menu's (or any other menu for that matter), render array so it can be accessed from a twig template. Among the many advantages of having full control of the menu's render array in a twig template is the ability to customize the markup for your menus to ensure they are accessible and comply with standards.

How to use

{# Get menu items #}
{% set items = simplify_menu('main') %}

{# Iterate menu tree #}
<nav class="navigation__items">
  {% for menu_item in items.menu_tree %}
    <li class="navigation__item">
      <a href="{{ menu_item.url }}">{{ menu_item.text }}</a>
    </li>
  {% endfor %}
</nav>

Blog post

Read a detailed blog post by Tim Dickens of Mediacurrent.
https://www.mediacurrent.com/blog/simplify-menu-and-twig-macros