Create custom widget area(dynamic sidebar) in WordPress

Paste following code in the functions.php file and it will add Custom Sidebar widget area in WordPress widgets page.

register_sidebar(
	array(
		'name'          => __( 'Custom Sidebar', 'textdomain' ),
		'id'            => 'custom-sidebar',
		'description'   => __( 'Custom Sidebar widget area', 'textdomain' ),
		'before_widget' => '<div id="%1$s" class="custom-widget %2$s">',
		'after_widget'  => '</div>',
		'before_title'  => '<h3 class="widget-title">',
		'after_title'   => '</h3>',
	)
);

Now paste following tiny code snippet in the template where you want to show widgets from this newly created widget area.

dynamic_sidebar('custom-sidebar');