That's a great question! It shows you're eager to learn.
Since you've successfully verified Nmap is installed, the next thing you can learn is how to use Nmap to scan a network. The current step you're on, "Installing Nmap", is now complete!
I recommend you move on to the next step in the lab, which will guide you through your first Nmap scan. This will help you understand the practical application of the tool you just installed.
Do you want to proceed to the next step?