Tips on Customizing Deep Core

How to Hide Deep Core Admin Menus

function plt_hide_deepcore_menus() {
	//Hide "Settings → Redux".
	remove_submenu_page('options-general.php', 'redux-framework');

	//Hide "Deep".
	remove_menu_page('wn-admin-welcome');
	//Hide "Deep → Dashboard".
	remove_submenu_page('wn-admin-welcome', 'wn-admin-welcome');
	//Hide "Deep → Demo Importer".
	remove_submenu_page('wn-admin-welcome', 'wn-admin-demo-importer');
	//Hide "Deep → Header Builder".
	remove_submenu_page('wn-admin-welcome', 'webnus_header_builder');
	//Hide "Deep → Footer Builder".
	remove_submenu_page('wn-admin-welcome', 'edit.php?post_type=wbf_footer');
	//Hide "Deep → Mega Menu".
	remove_submenu_page('wn-admin-welcome', 'edit.php?post_type=mega_menu');
	//Hide "Deep → Performance".
	remove_submenu_page('wn-admin-welcome', 'wn-admin-performance');
	//Hide "Deep → Plugins".
	remove_submenu_page('wn-admin-welcome', 'wn-admin-plugins');
	//Hide "Deep → Help".
	remove_submenu_page('wn-admin-welcome', 'wn-admin-help');
	//Hide "Deep → Wizard".
	remove_submenu_page('wn-admin-welcome', 'index.php?page=webnus-setup-wizard');
	//Hide "Deep → Options".
	remove_submenu_page('wn-admin-welcome', 'wn-admin-options');
}

add_action('admin_menu', 'plt_hide_deepcore_menus', 11);

Where do I put this code?

How to Hide Deep Core Meta Boxes

function plt_hide_deepcore_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "Post Options" meta box.
	remove_meta_box('post-options', $screen->id, 'normal');
	//Hide the "Page Options" meta box.
	remove_meta_box('page-options', $screen->id, 'normal');
	//Hide the "Portfolio Options" meta box.
	remove_meta_box('portfolio-options', $screen->id, 'normal');
	//Hide the "Mega Menu Options" meta box.
	remove_meta_box('mega-menu-options', $screen->id, 'normal');
}

add_action('add_meta_boxes', 'plt_hide_deepcore_metaboxes', 20);