title: Log in as root on psql
body: <p>What does the below command mean that you "login as root"? I don't understand when do you create a user or when you don't have to. If you're logging in as root, does that mean you're just the official super user or something that can create all other users? What's the difference between this and creating other users/roles? If I can get an analogy to understand that would be great.</p>
  
  <pre><code>su - postgres
  </code></pre>