Thank you, but it’s not working
<?php
$category = get_the_category();
$name= $category[0]->name;
$slug= $category[0]->slug;
$id = $category[0]->cat_ID;
$sous_titre = get_field('sous_titre_categorie', $category );
?>
<div class="block-site title-cat" id="block-Apropos">
<h1><?php echo $name ?><br/>
<span> <?php echo $sous_titre ?></span>
</h1>
</div>