When using namespaces, what does SAP recommend you use to construct names for namespaces?

You want to connect an SAP backend system to the SAP BTP using the SAP Cloud Connector.
Which additional SAP BTP services are required for the connection? Note: There are 2 to choose.

In data models, are namespaces optional or mandatory?

At what level can you select a region?

You use SAP Continuous Integration and Delivery for your CAP project. Where can you access the Webhook Event Receiver?