title: Invalid Firebase path: .com. Firebase paths must not contain '.', '#', '$', '[', or ']'
body: <p>I'm going to save the email and password in a Firebase database, but unfortunately I got this error. </p>
  
  <pre><code>Invalid Firebase path: .com. Firebase paths must not contain '.', '#', '$', '[', or ']'
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/fSPE5.jpg" rel="noreferrer"><img src="https://i.stack.imgur.com/fSPE5.jpg" alt="enter image description here"></a> </p>