MacStories invited Alex Guyot to write a gigantic guide to understanding iOS automation:
“This article will attempt to centralize all of the necessary information for a complete beginner to quickly and easily go from little to no prior knowledge of the subject to being able to understand and build their own complex workflows with Drafts and URL actions. I will only be focusing on Drafts here, but the skills learned throughout this guide should be easily transferable to other apps.”
It doesn't get much more nerdy (or awesome) than this, folks. Keep it bookmarked and study up.