Creating a widget and display

function betts_foot_widgets_init() {
        
  register_sidebar( array(
        'name' => __( 'Home Page Widget', 'betts' ),
        'id' => 'home_side',
        'description' => __( 'An optional widget area for your site ', 'betts' ),
        'before_widget' => '<aside id="%1$s" class="widget %2$s">',
        'after_widget' => "</aside>",
        'before_title' => '<h3 class="widget-title">',
        'after_title' => '</h3>',
    ) );

    register_sidebar( array(
        'name' => __( 'Header Widget', 'betts' ),
        'id' => 'head_side',
        'description' => __( 'An optional widget area for your site ', 'betts' ),
        'before_widget' => '<aside id="%1$s" class="widget %2$s">',
        'after_widget' => "</aside>",
        'before_title' => '<h3 class="widget-title">',
        'after_title' => '</h3>',
    ) );

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

Display widget code -

          <?php
                    /* A sidebar in the footer? Yep. You can customize */
                      dynamic_sidebar('first-footer-widget-area');
                ?>