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

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

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' );