It's going to be a little like learning any other programming language you aren't familiar with in the sense that some of the material you'll be looking at will spend some time on elementary programming concepts that you already thoroughly understand (what is a variable? what is a function?), but in UE's case trying to immediately skip learning materials that bill themselves as basic or beginner-level is probably a mistake, because much of the engine's functionality isn't directly code-related. Learning these parts of the engine is more like, say, learning pieces of the Adobe Creative Suite than it is like learning a programming language. Even as someone who's generally familiar with UE, I still find myself constantly googling how do I [perform simple-sounding task that I know I've done before} in Unreal simply because the scope of the engine is so large.

The other thing is that, because there's so much stuff going on in the engine, the API for interacting with the engine via code is extremely complicated. Most tutorials, even beginner-level ones, are at least as much about how the API works as they are about how to code in a broad sense.

So I'd suggest starting with beginner-level stuff. It's likely that you'll grasp the basics of how UE works fairly quickly, and from there you can start doing more narrowly targeted research on the areas that either particularly interest you or that weren't covered in enough depth in the intro learning materials.