title: Vim lookup help for visual mode key bindings
body: <p>When I'm not sure what a key does in Vim I type in the help command. </p>
  
  <p>e.g.</p>
  
  <pre><code>:help u
  </code></pre>
  
  <p>It shows me what key 'u' does in normal mode (undo).</p>
  
  <p><strong>What is the command to get help for 'u' in visual mode?</strong></p>
  
  <p>I'm asking because I stumbled upon this 'u' in visual model (selected text becomes lowercase), but I would like to know how to look up help for visual mode key bindings.</p>