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<?php
// CSS
$css_file_path = get_template_directory_uri() . '/assets/css/website-responsive.css';
wp_enqueue_style(
  'site_responsive', 
  $css_file_path, 
  false, 
  filemtime( $css_file_path )
);

// JAVASCRIPT
$js_file_path = get_template_directory_uri() . '/assets/js/main.js';
wp_register_script(
  'js_main', 
  $js_file_path, 
  false, 
  filemtime( $js_file_path ), 
  true
);