Enqueueing CSS & JS files in functions.php

function fire_scripts () {
  wp_register_style ('fontawesome', get_template_directory_uri().'/src/fontawesome/css/font-awesome.min.css');

  wp_enqueue_style('fontawesome');

  wp_register_script ('bxslider', get_template_directory_uri().'/src/bxslider/jquery.bxslider.min.js', array ('jquery'));

  wp_enqueue_script('jquery'); //Main jquery call from wordpress.
  wp_enqueue_script('bxslider');

}
add_action('wp_enqueue_scripts', 'fire_scripts');