title: link_to vs url_for vs path in Rails
body: <p>I'm starting learn Ruby on Rails and I have some doubts. </p>
  
  <p>I already see the <a href="http://api.rubyonrails.org/" rel="noreferrer">Rails documentation</a> but I don't understand at all the differences between:</p>
  
  <ul>
  <li>url_for</li>
  <li>link_to</li>
  <li>path</li>
  </ul>
  
  <p>And how I can use / discover the paths of my application? Further, can I send a parameter in path, like: </p>
  
  <pre><code>&lt;%= users_path + "/user.id/" %&gt;  
  </code></pre>
  
  <p>Is there anything like that?</p>