What are some use cases of :e in Vim?
<p>I was reading <a href="http://vimhelp.appspot.com/editing.txt.html#:edit" rel="noreferrer"><code>:help :edit</code></a> but I really don't understand the following sentence: </p>

<blockquote>
  <p>This is useful to re-edit the current file, when it has been changed outside of Vim</p>
</blockquote>

<p>And what does <em>start all over</em> mean in <a href="http://vimhelp.appspot.com/editing.txt.html#:edit!" rel="noreferrer"><code>:help :edit!</code></a>? </p>

<blockquote>
  <p>This is useful if you want to start all over again</p>
</blockquote>

<p>Could anyone please provide some use cases of them?</p>