This is sample of WordPress query by taxonomy $TaxQuerya[] = array( 'taxonomy' => 'category', 'field' => 'slug', 'terms' => 'new

Yes! Now you can change your WordPress default title placeholder text by using this code. add_filter( 'enter_title_here', 'unique_function_name' );

For register custom post type in WordPress this Article will helpful for you. add_action( 'init', 'unique_function_name' ); function unique_function