HTML

Show all the tags

$tags = get_tags();
$html = '<div class="post_tags">';
foreach ( $tags as $tag ) {
    $tag_link = get_tag_link( $tag->term_id );
             
    $html .= "<a href='{$tag_link}' title='{$tag->name} Tag' class='{$tag->slug}'>";
    $html .= "{$tag->name}</a>";
}
$html .= '</div>';
echo $html;

show all tags

<?php
         $tags = get_tags();
         $html = '<div class="tagcloud">';
         foreach ($tags as $tag) {
            $tag_link = get_tag_link($tag->term_id);

            $html .= "<a href='{$tag_link}' title='{$tag->name} Tag' class='{$tag->slug}'>";
            $html .= "{$tag->name}</a>";
         }
         $html .= '</div>';
         echo $html;
         ?>