title: Should I learn Google Cloud Messaging or Firebase for Android?
body: <p>I'm following an android tutorials from Udacity which was made around 2014, on the final lesson it uses Google Cloud messaging.
  (<a href="https://classroom.udacity.com/courses/ud853/lessons/1614738811/concepts/16346189090923#" rel="nofollow">https://classroom.udacity.com/courses/ud853/lessons/1614738811/concepts/16346189090923#</a>)</p>
  
  <p>From the website of GCM it recommend to use Firebase.</p>
  
  <p>Should I skip this lesson and Jump to another course of Udacity which focuses on Firebase?</p>