Unfortunately, no. I was hired as a WordPress developer on a team that did a lot of Drupal work, so I was able to gently ease into doing small projects. Understanding the Drupal render pipeline will help you immensely, but it is complicated. Merely being able to understand entity types, fields, and views will put you leagues ahead of what WordPress can do for data-heavy sites. The majority of what I do with Drupal is configuring entities, fields, view, modes, and views. After that, it’s basically just learning to twig syntax (not my favorite part of Drupal) and the various pre-process hooks to make data available to the theme. Once you have the core functionality pretty well understood, it’s easy to extend it because basically everything in Drupal already extends Symfony.