title: What is difference between :o and :e in vim when using these command to load a file into the buffer?
body: <p>I was watching an online tutorial  by tutsplus , during one of the lessons, the teacher started to move between buffers using :bn :bn :b#, but he forget to mention how to load files into the buffer before talking about navigating between the buffers, I searched and find that using:e filename or :o filename would load a file into the buffer. </p>
  
  <p>So, what is the difference , I can't understand the document explanation provide within vim. </p>