一种方法是创建一个模板页面，在该页面中，您将具有显示想要显示的类别的逻辑。您的模板页面如下所示：

/*
Template Name: Secondary Blog Page
*/

get_header();

/*Code for your custom category display*/
$customcats = new WP_Query(array(
    \'cat\' => 12,13,15  //Category ID\'s
));
if($customcats->have_posts()):

while($customcats->have_posts()): $customcats->the_post();
    //code to display the posts however you want
endwhile;

endif;
wp_reset_postdata();

get_sidebar();
get_footer();