I have troubles with getting the posts primary set category. How should I achieve this?

My code:

global $post;
$terms = get_the_terms( $post->ID, 'event-categories');

if($terms) {
    foreach( $terms as $term ) {
        $cat_obj = get_term($term->term_id, 'event-categories');
        $cat_slug = $cat_obj->slug;

and in my html

<div class="post_kachel <?php echo $cat_slug; ?>">
  • Anyone? If something is not clear, then please tell me - I'll try to explain it as best as I can. – SengelYTPI Nov 30 '18 at 12:18

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