Add Multiple Sidebars (widget sections)

function multiple_sidebars_init() {
    register_sidebar( array(
        'name'          => __( 'Sidebar', 'themename' ),
        'id'            => 'sidebar-1',
        'description'   => 'Sidebar for all pages',
        'before_widget' => '<aside id="%1$s" class="widget %2$s">',
        'after_widget'  => '</aside>',
        'before_title'  => '<h1 class="widget-title">',
        'after_title'   => '</h1>',
    ) );

    register_sidebar( array(
        'name'          => __( 'Sidebartwo', 'themename' ),
        'id'            => 'sidebar-2',
        'description'   => 'Sidebar for product page',
        'before_widget' => '<aside id="%1$s" class="widget %2$s">',
        'after_widget'  => '</aside>',
        'before_title'  => '<h1 class="widget-title">',
        'after_title'   => '</h1>',
    ) );

}
add_action( 'widgets_init', 'multiple_sidebars_init' );