What if you have to link to a specific url in in twig, but you only have the nid? Moreover, it is good practice to use the id and not a hardcored url. Here's what you should use:

Helper snippet to render images with an image style in drupal 8

String translations are always a bit a pain in the ass for drupal. Luckily, in drupal 8 the function is rather easy.

Snippet on how to remove all users with a certain role in drupal.

I play a lot with importing and exporting content lately. When I remove content, the created menu items need to be removed automatically. Here's a snippet on how to delete all links in a menu.