Question on Creating A Child Theme

Been reading through the documentation on creating a child theme of the twentythirteen theme and I’m a bit confused. The documentation says I must enque the stylesheets but I don’t know anything about php so I am not sure how to add the extra stylesheets inside of the css folder in the following code:

add_action( 'wp_enqueue_scripts', 'theme_enqueue_styles' );
function theme_enqueue_styles() {
    wp_enqueue_style( 'parent-style', get_template_directory_uri() . '/style.css' );

}

I tried adding ‘/css/ie.css’, ‘/css/editor-style.css’ to the existing code but that won’t work. Can anyone provide me with the correct format?