In your functions.php you can register new sidebars with this code

/**
 * Registers sidebars
 *
 * @param array Array with default or specified array values
 * @since       1.0.0
 */
if ( function_exists( 'register_sidebar' ) ) {
    register_sidebar( array (
        'name'          => esc_html__( 'Primary Sidebar', 'mytheme'),
        'id'            => 'primary-widget-area',
        'description'   => esc_html__( 'The Primary Widget Area', 'mytheme'),
        'before_widget' => '<div id="%1$s" class="widget %2$s">',
        'after_widget'  => '</div>',
        'before_title'  => '<div class="sidebar-widget-heading"><h3>',
        'after_title'   => '</h3></div>',
    ) );

    register_sidebar( array (
        'name'          => esc_html__( 'Secondary Sidebar', 'mytheme'),
        'id'            => 'secondary-widget-area',
        'description'   => esc_html__( 'The Secondary Widget Area', 'mytheme'),
        'before_widget' => '<div id="%1$s" class="widget %2$s">',
        'after_widget'  => '</div>',
        'before_title'  => '<div class="sidebar-widget-heading"><h3>',
        'after_title'   => '</h3></div>',
    ) );
}

You can add as many sidebars as you want to.

You can also create your own sidebar file in the theme to call it on different templates. Copy and paste sidebar.php of current theme and change the name (i.e. sidebar-book.php)

In the template you can call this sidebar using get_sidebar('book'). Using this you can call different sidebars on different pages.