File: //var/www/linde-ai/wp-content/themes/linde/pages/courses.php
<?php
/*
 * Template Name: Courses
 *
 */
$context = Timber::context();
$timber_post     = new Timber\Post();
$context['post'] = $timber_post;
$terms = Timber::get_terms(array(
    'taxonomy' => 'linde_module'
), array(), "ModuleTerm");
usort($terms, function($a, $b)
{
    return strcmp($a->order_number, $b->order_number);
});
$context['modules'] = $terms;
foreach ($terms as $term) {
    $args = array(
        'post_type'   => 'linde_course',
        'meta_key' => 'session_number',
        'posts_per_page' => 200,
        'orderby' =>  'meta_value_num',
        'order' => 'ASC',
        'tax_query' => array(
            array(
                'taxonomy' => 'linde_module',
                'field'    => 'slug',
                'terms'    => $term->slug,
            ),
        ),
    );
    $term->courses = new Timber\PostQuery($args, "PostCourse");
}
$context['courses'] = $terms;
$context_sections = array();
Timber::render( array( 'pages/courses.twig', 'page.twig' ), $context );