WordPress Function to Exclude Categories from Front Page

gistfile1.txt

<?php //
/**
 * Do Not Include Above Opening PHP tag
 * Copy/Paste Below code into functions file
 * Replace the -1 to your unique category id number
 * More than 1 category can be separated by a comma
 */

//* Function to Remove categories
function exclude_category_home( $query ) {
if ( $query->is_home ) {
$query->set( 'cat', '-1' );
}
return $query;
}
 
add_filter( 'pre_get_posts', 'exclude_category_home' );