title: Ruby on rails: start_form_tag method
body: <p>I'm trying to learn ruby on rails.  I've been going through a tutorial, but I've gotten stuck.  </p>
  
  <p>It has me using <code>start_form_tag</code> and <code>end_form_tag</code> around an input form.  However, when I access the page, I get <code>undefined method 'start_form_tag' for #&lt;ActionView::Base:0x2556020&gt;</code></p>
  
  <p>In the tutorial, they explain that these two lines are translated into <code>&lt;form action="/book/create" method="post"&gt;</code> and <code>&lt;/form&gt;</code>.   As such, I tried putting those instead.  The form out come up, but when I submitted the form, I get this error: <code>ActionController::InvalidAuthenticityToken in BookController#create</code></p>
  
  <p>So,</p>
  
  <ol>
  <li>What do I have to do to get start_form_tag to translate correctly?</li>
  <li>Is this causing the InvalidAuthenticityToken error?</li>
  </ol>