Configuring count cards in Konstrukt, the back office UI builder for Umbraco.
Count cards allow you to define cards directly against the collection configuration, providing a basic where clause to use in a count SQL statement. These work perfectly for simple data visualizations based on simple counts of entities in a collection.
If you need to do more than a simple count, you'll want to take a look at the custom cards documentation.
Adding a count card to a collection
Cards allow you to display simple summaries of key information that may be useful to the editor.