“Post Exclude” is a feature or functionality in WordPress that allows you to exclude specific posts or pages from being displayed in certain contexts. This can be useful in variousscenarios, such as when you want to prevent certain content from appearing in a particular listing or archive.

There are several ways to implement post exclusion in WordPress:

Method – 1 (without plugin)

To exclude a specific category from the front page in WordPress, you can modify the main query of the front page using a custom function in your theme’s functions.php file or in a custom plugin. Here’s how you can achieve this:

function exclude_category_from_front_page( $query ) {
    if ( $query->is_home() && $query->is_main_query() ) {
        $excluded_category_id = 5; // Replace 5 with the ID of the category you want to exclude
        $query->set( 'cat', '-' . $excluded_category_id );
    }
}
add_action( 'pre_get_posts', 'exclude_category_from_front_page' );

Replace 5 in $excluded_category_id with the ID of the category you want to exclude. You can find the ID of a category by navigating to the WordPress dashboard, then to Posts > Categories, hover over the category you want to exclude, and look at the URL. The ID will be visible in the URL as tag_ID.

This function hooks into the pre_get_posts action, which allows you to modify the parameters of the main query before it is executed. It checks if the current query is for the home page and is the main query, and then modifies the query to exclude the specified category.

After adding this code to your theme’s functions.php file or a custom plugin, the specified category should no longer appear on the front page.

How i category ID ?

Locate the Category: Look for the category whose ID you want to find. If you hover over the category name or copy the edit link, you’ll see a link at the bottom of your browser window. The link will look something like this: https://yourdomain.com/wp-admin/term.php?taxonomy=category&tag_ID=2&post_type=post&wp_http_referer=%2Fwp-admin%2Fedit-tags.php%3Ftaxonomy%3Dcategory
. In this link, the tag_ID=2 part indicates the ID of the category. In this example, the category ID is 2.

Check the image