Custom Shortcode to display First Category in Genesis. https://sridharkatakam.com/custom-shortcode-to-display-first-category-in-genesis/

functions.php

add_shortcode( 'post_category', 'sk_post_category_shortcode' );
/**
 * Produces the first category link.
 *
 * Supported shortcode attributes are:
 *   after (output after link, default is empty string),
 *   before (output before link, default is 'Tagged With: '),
 *   sep (separator string between tags, default is ', ').
 *
 * Output passes through 'genesis_post_categories_shortcode' filter before returning.
 *
 * @since 1.1.0
 *
 * @param array|string $atts Shortcode attributes. Empty string if no attributes.
 * @return string Shortcode output
 */
function sk_post_category_shortcode( $atts ) {

	$atts = shortcode_atts (
		array(
			'sep'    => ', ',
			'before' => __( 'Filed Under: ', 'genesis' ),
			'after'  => '',
		),
		$atts
	);
	
	$atts = shortcode_atts( $defaults, $atts, 'post_categories' );

	$category = get_the_category();

	$cat = '<a href="' . get_category_link( $category[0]->term_id ) . '">' . $category[0]->cat_name . '</a>';

	if( $category[0] ) {
		$output = sprintf( '<span %s>', genesis_attr( 'entry-category' ) ) . $atts['before'] . $cat . $atts['after'] . '</span>';
	}

	return apply_filters( 'genesis_post_categories_shortcode', $output, $atts );

}

gistfile1.php

add_shortcode( 'post_category', 'sk_post_category_shortcode' );
/**
 * Produces the first category link.
 *
 * Supported shortcode attributes are:
 *   after (output after link, default is empty string),
 *   before (output before link, default is empty string),
 *   sep (separator string between tags, default is ', ').
 *
 * Output passes through 'genesis_post_categories_shortcode' filter before returning.
 *
 * @since 1.1.0
 *
 * @param array|string $atts Shortcode attributes. Empty string if no attributes.
 * @return string Shortcode output
 */
function sk_post_category_shortcode( $atts ) {

	$atts = shortcode_atts (
		array(
			'sep'    => ', ',
			'before' => '',
			'after'  => '',
		),
		$atts
	);

	$category = get_the_category();

	$cat = '<a href="' . get_category_link( $category[0]->term_id ) . '">' . $category[0]->cat_name . '</a>';

	if( $category[0] ) {
		$output = '<span class="'. $category[0]->slug .'">' . $atts['before'] . $cat . $atts['after'] . '</span>';
	}

	return apply_filters( 'genesis_post_categories_shortcode', $output, $atts );

}