how to exclude specific category types (uncategorized) from blog page?

by

Please try code given below:

function blog_exclude_category( $query ) {
    if ( $query->is_home() && $query->is_main_query() ) {
        $query->set( 'cat', '-1' );
    }
}
add_action( 'pre_get_posts', 'blog_exclude_category' );

Add this in your functions.php