Thanks for adding that Quincy Larson. Yes, I have noticed that and they are super useful. Keep up the good work and inspiring us. I have now updated the article to include your comment and a link to the freeCodeCamp Youtube channel.
Written by javinpaul
I am Java programmer, blogger, working on Java, J2EE, UNIX, FIX Protocol. I share Java tips on http://javarevisited.blogspot.com and http://java67.com