You can have primary and secondary content in a headline. Primary content consists of up to two lines of text across the screen. The content should emphasize the main action or focus of the skill content at that particular moment for the user.
Secondary content is limited to one line. You present secondary content after primary content. The template truncates any secondary text for smaller device modes.
For example, a headline is great for a welcome message. “Welcome to Cupcake Shop! Let’s get you a cupcake, pronto.” Your hint text could tell the customer how to order a cupcake: “Just say ‘chocolate cupcake’ or another kind of cupcake to get started.”