Answers for "how to get post for categories in wordpress"

wp get all post categories

$categories = get_categories();
foreach($categories as $category) {
   echo '<div class="col-md-4"><a href="' . get_category_link($category->term_id) . '">' . $category->name . '</a></div>';
}

get category post in wordpress

echo '<p>'. get_the_category( $id )[0]->name .'</p>';