functions.php

/*Update following in your WordPress theme's functions.php file */

// Remove Query String from Static Resources
function remove_cssjs_ver( $src ) {
if( strpos( $src, '?ver=' ) )
 $src = remove_query_arg( 'ver', $src );
return $src;
}
add_filter( 'style_loader_src', 'remove_cssjs_ver', 10, 2 );
add_filter( 'script_loader_src', 'remove_cssjs_ver', 10, 2 );

// Remove Emojis
remove_action('wp_head', 'print_emoji_detection_script', 7);
remove_action('wp_print_styles', 'print_emoji_styles');
remove_action( 'admin_print_scripts', 'print_emoji_detection_script' );
remove_action( 'admin_print_styles', 'print_emoji_styles' );

// Remove Shortlink
remove_action('wp_head', 'wp_shortlink_wp_head', 10, 0);

// Disable Embed
function disable_embed(){
wp_dequeue_script( 'wp-embed' );
}
add_action( 'wp_footer', 'disable_embed' );

// Disable XML-RPC
add_filter('xmlrpc_enabled', '__return_false');

// Remove RSD Link
remove_action( 'wp_head', 'rsd_link' ) ;

// Hide Version
remove_action( 'wp_head', 'wp_generator' ) ;

// Remove WLManifest Link
remove_action( 'wp_head', 'wlwmanifest_link' ) ;

// Disable JQuery Migrate
function deregister_qjuery() {  
    if ( !is_admin() ) {
        wp_deregister_script('jquery');
    }
}  
add_action('wp_enqueue_scripts', 'deregister_qjuery'); 

// Disable Self Pingback
function disable_pingback( &$links ) {
  foreach ( $links as $l => $link )
        if ( 0 === strpos( $link, get_option( 'home' ) ) )
            unset($links[$l]);
}

add_action( 'pre_ping', 'disable_pingback' );

// Disable Heartbeat
add_action( 'init', 'stop_heartbeat', 1 );
function stop_heartbeat() {
wp_deregister_script('heartbeat');
}

// Disable Dashicons in Front-end
function wpdocs_dequeue_dashicon() {
	if (current_user_can( 'update_core' )) {
	    return;
	}
	wp_deregister_style('dashicons');
}
add_action( 'wp_enqueue_scripts', 'wpdocs_dequeue_dashicon' );

// Disable Contact Form 7 CSS/JS on Every Page
add_filter( 'wpcf7_load_js', '__return_false' );
add_filter( 'wpcf7_load_css', '__return_false' );