My theme didn’t appear sidebar area

please Function.php file

function twentyseventeen_widgets_init() {   
    register_sidebar( array(
        'name'          => __( 'Blog Sidebar', 'twentyseventeen' ),
        'id'            => 'sidebar-1',
        'description'   => __( 'Add widgets here to appear in your sidebar on blog posts and archive pages.', 'twentyseventeen' ),
        'before_widget' => '<section id="%1$s" class="widget %2$s">',
        'after_widget'  => '</section>',
        'before_title'  => '<h2 class="widget-title">',
        'after_title'   => '</h2>',
    ) );    
}
add_action( 'widgets_init', 'twentyseventeen_widgets_init' );

then after calling any template otherwise any files(header.php, footer.php etc)

also, add any widget in widget page in admin the name is ‘Bolg sidebar’