This list shows all the registered post types. The common types include page, post, product (if using WooCommerce) and your custom post types.
This list shows all the registered taxonomies. The common types include category, tag (post_tag), post formats (post_format).
Posts per page:
Set the numbers of posts per page in this list.
Enable or disable pagination for this list. Pagination should only be used if your posts are the only thing in the content area to prevent duplicate content issues.
AJAX Pagination (pro option): Replace the default pagination with AJAX pagination.