I like to think I've mastered the long-range close-up; it's kinda my thing. A 70-300 mm lens is my default and it spends more time at 300 than 70. I started on a fixed 500mm cassegrain-style manual lens 8 years ago and I just fell in love with it.
Edit: I use two remote controlled flashes with mini softboxes. The whole thing started out of necessity because at the club, when you have your flash on your camera or behind you, the fog just results in a mostly white photo.
I'd honestly say that post-processing is my strenght and even though that alone isn't exactly a photography technique I guess that I somewhat master the ability to take photos in a way that I can later make them "pop" with editing.
I guess another way of saying that is that I've mastered underexposing photos.