How plug big part of code to your function.php file. WordPress

 <!-- create a new php file and upload it to the inc folder in your theme directory
(you can change the name of the created folder) -->

<!-- replace the name of the file you created in code, insert this code in your function.php  -->

require get_template_directory() . '/inc/home-page-settings.php';
require get_template_directory() . '/inc/customizer.php';