title: How do I install Ruby gems when using RVM?
body: <p>I set up RVM and used it to install Ruby and a few other libraries. As I was going through various tutorials and set-ups of other technologies like Rails, I began getting confused about what I should do via RVM and what I should just do as the tutorials suggest.</p>
  
  <p>One example is the RubyGems tutorial here:
  <a href="http://rubygems.org/pages/download" rel="noreferrer">http://rubygems.org/pages/download</a></p>
  
  <p>Should I download that tar file they are talking about?  Seems unnecessary since that is what I thought RVM was for.  Do I even need RubyGems?  What is that for really? </p>
  
  <p>Also, how do I actually get Rails?  Is there a precise RVM command to actually download and install Rails?</p>