how to use t() in twig file?

Translation filters
trans
This filter (alternatively, t) will run the variable through the Drupal t() function, which will return a translated string. This filter should be used for any interface strings manually placed in the template that will appear for users.

Example:
<a href="{{ url('<front>') }}" title="{{ 'Home'|t }}" rel="home" class="site-logo"></a>