Custom post types in home and blog pages

cpts_in_main_query

// Add custom post types to the home and blog pages
// change 'cpt1' and 'cpt2' to your post type names

add_filter( 'pre_get_posts', 'my_get_posts' );

function my_get_posts( $query ) {

	if ( is_home() && $query->is_main_query() )
		$query->set( 'post_type', array( 'post', 'cpt1', 'cpt2' ) );

	return $query;
}