Add custom fields to the author profile fields WordPress

add-fields.php

<?php
 
add_filter( 'user_contactmethods', 'my_new_contactmethods', 10, 1 );
/**
 * Add custom fields to the author profile fields
 *
 */
function my_new_contactmethods( $contactmethods ) {
 
	$contactmethods['twitter'] = 'Twitter'; // Add Twitter
	$contactmethods['facebook'] = 'Facebook'; //add Facebook
	return $contactmethods;
	
}
 
/* Display the field option 1 */
the_author_meta( 'facebook', $current_author->ID ); 

/* Display the field option 2 */
$current_author = get_userdata( get_query_var( 'author' ) ); 
?>
<p>
	<a href="<?php echo esc_attr( $current_author->facebook );?>">Facebook</a>
</p>