Multiple sites on same domain.

I have a site and also want a complete different site on
How do i do that.
I don`t want to do something wrong :disappointed:
What do i do in the prefix table?
And is it right that i use the same mysql codes on both sites?
I have change the authkey to nonce salt.
I want the two sites have nothing to do with eachother :slight_smile:
Any idea?
Best regards