Register and Display a Sidebar in Wordpress

To register and display the Sidebar in WordPress you have to follow the two steps.

Step: 1 You have to add this in the Function.php file in your theme
Below the "wpb alone should be replaced by your theme name"

function wpb_widgets_init() {
    register_sidebar( array(
        'name' => __( 'Main Sidebar', 'wpb' ),
        'id' => 'sidebar-1',
        'description' => __( 'The main sidebar appears on the right on each page except the front page template', 'wpb' ),
        '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' =>__( 'Front page sidebar', 'wpb'),
        'id' => 'sidebar-2',
        'description' => __( 'Appears on the static front page template', 'wpb' ),
        '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', 'wpb_widgets_init' );

Step: 2 Display it Dynamically in the Page where ever you want by adding the below code

<?php if ( is_active_sidebar( 'sidebar-1' ) ) : ?>
    <div id="secondary" class="widget-area" role="complementary">
    <?php dynamic_sidebar( 'sidebar-1' ); ?>
    </div>
<?php endif; ?>

Note: " is_active_sidebar( 'sidebar-1' )" - The sidebar-1 is the id of the registered sidebar in the function.php file. If the id is not used properly the Sidebar will not be displayed even if the registration is correct.