Load Balancing is a critical step when the number of users on your site exceed the maximum number of users a single server can handle. The aim of this task to set up a drupal 8 installation using two application servers, a single database server and a load-balancer(you can use whatever load balancer prefered) and document all the steps involved in a screencast. This task mainly invovles configuring the web sevrers and drupal installation to work with multiple servers. Some helpful resources are- https://www.drupal.org/node/425990
http://www.johnandcailin.com/blog/john/scaling-drupal-step-two-sticky-load-balancing-apache-modproxy