Is it ok not to set widget in the main page of a one page WordPress Theme?

Question

The theme I have been developing for ThemeForest is a one page WordPress personal portfolio theme. There is no widget in the main page design which is the only showcase page of this one page theme and I didn’t set any widget in that page.

But I register a sidebar in footer for other pages like index.php, page.php, single.php, archive.php, search.php etc.

1. Is it ok not to set widget in the main page?
2. Is it allowed to register widget in the thememode (not as a plugin)?

Answer 1

1. Q. -> you can to set widget in main page, only need to create specify widget

2. Q. ->

   function register_my_widget(){
   register_sidebar( array(
       'name'          => esc_html__('Sidebar', 'youthemename'),
       'id'            => 'widget-1',
       'description'   => esc_html__('My first Widget', 'youthemename'),
       'before_widget' => '<div class="widget %2$s">',
       'after_widget'  => '</div>',
       'before_title'  => '<h4 class="widget-wtitle">',
       'after_title'   => '</h4>'
   ) );
   }
   add_action( 'widgets_init', 'register_my_widget' );