In the past few years, multiple agencies have hired people new to Drupal introduced them to the topic. Just recently, we also have multiple newcomers and the need to have a nice collection of learning resources for getting started.
"Learning Drupal" is a very wide topic, and sometimes it's about gaining fundamental knowledge of git, bash and many other tools first.
It's a pity that every agency does their own research to identify valuable learning resources. We want to change that.
The idea is to start with two components: