Change the default text in the title field of a WordPress post (post, page, or custom post type)

WordPress Default Title

function change_default_title( $title ) {
     
	$screen = get_current_screen();
	if ( 'post' == $screen->post_type ) { // Replace 'post' with the name of the post type you want to use with the new title
		$title = 'Enter headline here';
	}
	return $title;
}
add_filter( 'enter_title_here', 'change_default_title' );