IncludePartTemplateWithAndWithoutvariables.twig

{# Include a part template using Twig namespaces to declare the current theme templates directory. #}
{% include '@theme_name/inc/header.html.twig' %}

{# Include a part template with variables. #}
{% set variables = {
    'name': 'Boldizar',
    'date': 'nov'|date('d.M. Y')
} %}
{% include 'template.html' with variables %}

{# Twig namespace '@theme_name' will be replaced with 'your_site.com/themes/theme_name/templates/'. #}