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How can I add category descriptions to the theme?

First, disable the heat index for categories in the theme options.

Then add this function to the functions/theme.php file (after line 278)

if (!function_exists('it_category_description')) {
    function it_category_description () {
    $out = '';
        if(is_archive()) {
            $post = $posts[0]; # Hack. Set $post so that the_date() works.
            if (is_category()) {
            $out = category_description ();
            } elseif( is_tag() ) {
            $out = tag_description ();
            }
        }
    return $out;    
    }
}

And then add this to the footer.php file before footer

<?php if(is_archive()) { ?>
        <?php $archive_description = it_category_description(); ?>
            
        <?php if($archive_description!='') { ?>
        <div class="container-fluid no-padding builder-section builder-html category-descriptions">
            <div class="row">
                <div class="col-md-12">
                    <div class="container-inner">
                        <div class="html-inner">
                            <div class="html-content clearfix">
                                <?php echo $archive_description ?>
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
         <?php } ?>
     <?php } ?>

Class category-descriptions - for style of text in block, other classes are from the theme.