PHP

set posts_per_page

global $wp_query;
$wp_query->set('posts_per_page', 1);
$wp_query->query($wp_query->query_vars);

posts_per_page offet

function wpsites_exclude_latest_post( $query ) {
	if ( $query->is_home() && $query->is_main_query() ) {
		$query->set( 'offset', '1' );
	}
}

add_action( 'pre_get_posts', 'wpsites_exclude_latest_post', 1 );