I'm on the same path
You can find a good overview for the different concepts (blueprints, actors, components, game modes...) of Unreal Engine 4 here: Unreal Engine: Getting Started.
Once you have a rough idea of how the engine is put together, you can follow this free book: Blueprints - Master the Art of Unreal Engine 4 Blueprints
The book is very specific (less a comprehensive explanation and more a "look over my shoulder while I make something"), but if you've already got some experience with other engines or know a bit about their design, you can probably connect the dots and figure out the general workings. While learning the workflow of an experienced at the same time.