You can add placeholders in Text, Number, Email and File-Upload Nodes. A placeholder is simply greyed out text that appears in the field and gives the user a hint about what they could enter. This is a good way to enhance the user experience of your module. Instead of repeating the question in the placeholder, you can rather enter an example of a suitable response. This is especially helpful if the response of your user needs to comply with certain guidelines (e.g. only allowing capital letters).