How to exclude a category from the loop on your home page

Just add this WordPress Code Snippet to the functions.php file in your current WordPress theme in order to exclude one or more categories from the loop on your home page.

/**
 * Exclude certain categories from home page loop
 *
 * @author jminfotech.com
 * @link http://www.jminfotech.com
 */
function exclude_categories($query) {
  if ( $query->is_home ) {
    $query->set('cat', '-1,-5,-10');
  }
  return $query;
}
add_filter('pre_get_posts', 'exclude_categories'); 

In the above code, the -1, -5, and -10 can be replaced by the 
Category ID for whichever category or categories you want to exclude 
from your home page loop.  This function above would exclude categories 
1, 5, and 10 from the home page