[WP] Registrando sidebar Widgets - Insira o código no arquivo functions.php do tema.

[WP] Registrando sidebar Widgets

<?php

/**
 * Register widget area.
 *
 * @link https://developer.wordpress.org/themes/functionality/sidebars/#registering-a-sidebar
 */
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>',
		)
	);

	register_sidebar(
		array(
			'name'          => __( 'Footer 1', 'twentyseventeen' ),
			'id'            => 'sidebar-2',
			'description'   => __( 'Add widgets here to appear in your footer.', 'twentyseventeen' ),
			'before_widget' => '<section id="%1$s" class="widget %2$s">',
			'after_widget'  => '</section>',
			'before_title'  => '<h2 class="widget-title">',
			'after_title'   => '</h2>',
		)
	);

	register_sidebar(
		array(
			'name'          => __( 'Footer 2', 'twentyseventeen' ),
			'id'            => 'sidebar-3',
			'description'   => __( 'Add widgets here to appear in your footer.', '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' );

?>