Can we host multiple websites in nginx at localhost?

I have a general question about nginx

Let say you don’t have a domain first, but you already fired up your droplets. You already success setup Nginx in your droplet.

But your plan is to host 2 website in the droplet So the first website is done, assuming the default nginx page is the first website.

Now, how can i host the second website? Remember for now i still dont have the domains. What to put in the nginx configuration (server_name) for the second website?

For the first website, i already use “server_name localhost;”

What sould i put for the second website?