How to create dynamic widgets in WordPress code example

Example: dynamic widget of wordpress

/* functions.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' );
    
    
    /*  footer-widgets.php file  */
    <aside class="widget-area" role="complementary" aria-label="<?php esc_attr_e( 'Footer', 'twentyseventeen' ); ?>">
			<div class="container">
				<div class="nw_prt">
					<div class="row">
						<div class="col-md-3">
							<div class="nw">
								<?php dynamic_sidebar('footer-1');?>
							</div>
						</div>
						<div class="col-md-3">
							<div class="nw">
								<?php dynamic_sidebar('footer-2');?>
							</div>
						</div>
                    </div>
				</div>
			</div>		
	</aside><!-- .widget-area -->