When working with an empty deployment, we tend to reuse the same "emptyState" description/short description that reads:

No {{val}} is configure for this cluster yet. To streams change events from a {{val}} you can configure a {{val}} by click the 'Add {{val}}' button.

For example, in the transform screen, we use this as

No transform is configure for this cluster yet. To streams change events from a transform you can configure a transform by click the 'Add {{val}}' button.

This text, as is, does not really make sense in the context of the individual decomposed items like sources, destinations, connections, and transforms. So we likely should introduce context-specific text that better describes each tab's empty state.