Custom post has been a very useful capability in WordPress. It makes it much more easier to organise custom content in WordPress as a CMS. For custom post, we can use tax_query to filter unwanted categories or display custom post of certain categories. It's fully configuration and you can combine multiple query too.
For more information: WP Query - Taxonomy Parameters
$args = array( 'post_type' => 'custom_post_name', 'post__not_in' => array(1,2,3), 'order' => 'ASC', 'posts_per_page' => 3, 'tax_query' => array( array( 'taxonomy' => 'custom_taxonomy_category', 'field' => 'id', //slug, id, name 'terms' => array( 1,2,3), 'operator' => 'NOT IN' //IN, NOT IN ), ) );
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