How to exclude categories from slider?

Hi folks,

I’d like to exclude some post categories from the slider.
I configured it to show auto-generated form my posts.

I’m importing some rss-feeds and give them a special categorie. I don’t want this category to be shown in the slider.

How can I achieve this? For the front-page, i used the function.php in my child theme, using this code:

function exclude_category_home( $query ) {
    if ( $query->is_home ) {
        $query->set( 'cat', '-4, -6, -62' );
    }
    return $query;
}

add_filter( 'pre_get_posts', 'exclude_category_home' );

Looking forward for your answers,
Jens