In this video, you may see how to update your Drush command line tool if you have Acquia Dev desktop locally installed and meanwhile a newer version of Drush is released.
It is basically being done with the help of composer and is really simple.
The idea is though not just to be another platform with some boring videos but all the videos to be inspired by real-world problems. That means something that you will most probably need if you work with Drupal.
We want you to be successful and we want to teach you everything we know about Drupal!
So watch the videos, try to follow and reproduce, ask questions and you will see you will be able to conquer this wonderful sea that Drupal 8 is.