A zettel with the role zettel is typically used to document your own thoughts. Such zettel are the main reason for using the software Zettelstore.
The only predefined zettel with the role zettel is the default home zettel, which contains some welcome information.
You are free to change this. In this case you should also modify this zettel so that it reflects your own use of zettel with the role zettel.