[Child-Theme] How to install and edit

Hello, I am using the versions generatepress 3.0.2 and GP Premium 1.12.2 .
I have a question about an instruction you recommend in the documents.
https://docs.generatepress.com/article/child-theme-issues/

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

1-The code must be removed from the subject child?
2- Should this code be removed from the parent theme?

And like the PHP functions in the parent theme, they should be copied blank, and then added to whatever one wants to edit?