Child theme – enqueueing style sheet

Hi, I am quite new to WordPress and themes and am trying to set up a site using Business Key. I want to make child theme, and I understnad the point of it but some of the detail is confusing me.
I found something explaining how to make a child theme and it says the stylesheets need to be enqueued, and gives this code to do that (in the child themes functions.php file).
<?php
function enqueue_parent_styles() {

$parent_style = ‘parent-style’; // This is ‘twentyfifteen-style’ for the Twenty Fifteen theme.

wp_enqueue_style( $parent_style, get_template_directory_uri() . ‘/style.css’ );
wp_enqueue_style( ‘child-style’,
get_stylesheet_directory_uri() . ‘/style.css’,
array( $parent_style ),
wp_get_theme()->get(‘Version’)
);
}
add_action( ‘wp_enqueue_scripts’, ‘enqueue_parent_styles’ );
?>

Thing is, I can’t find anywhere in Business Key that the main style is enqueued, and the code above says use the same name in the child theme as the parent theme does. Can you help please?

I did find some other themes (e.g. WooCommerce) that seem to say that none of this enqueueing is needed as the main theme handles it all in another way. Does this apply to Business Key?

I would appreciate a couple of pointers to get me started – thanks.