title: Should a beginner learner start from Rails 3 or Rails 4
body: <p>I want to get into RoR and I just got the <a href="http://shop.oreilly.com/product/0636920021322.do" rel="nofollow">Learning Rails 3</a> book but also version 4 of Rails is out, which I've been looking at it in <a href="http://ruby.railstutorial.org/ruby-on-rails-tutorial-book" rel="nofollow">Ruby on Rails Tutorial</a>. My question is: should I learn Rails 3 before jumping into 4? What's the difference between them?</p>