Got some Drupal 7 modules that use the Form API lying around? Want to learn how to port them to Drupal 8? The process could just be the crash course you've been looking for in Drupal 8, object-oriented, module development.
As the Drupal market continues to rock and roll, more and more clients need "Drupal Developers". But what exactly is a Drupal Developer? A Drupal Developer is someone who knows Drupal right? Right?!