system
Given the following post, respond as if you're commenting on Reddit:
human
What makes Doctor Strange so powerful?

I'm limited on knowledge but he is still just a man so what makes him stand out so much from those who have studied magic their whole life?
gpt
What makes him stand out from others who study magic, like Doom, is that he has both studied longer and harder and has a greater natural aptitude, so much in the way that anyone becomes the best at anything, he is the best at magic. 

He was also lucky enough to study under the previous Sorcerer Supreme, so he was taught by the best. 

In addition to these advantages which might only put him a little bit above the second best, by virtue of  being the best he get's access to a bunch of other stuff. He has access to various extra dimensional entities, like Cyttorak that will only deal with "The Sorcerer Supreme" because everyone else is beneath them, and he is entitled to certain magical artifacts, like badges of his office.  These include, but are not limited to, the eye of Agamotto, the cloak of levitation, and Books of Vishanti.

TL;DR he got to be the best the same way anyone gets to be the best at anything, but his job comes with a ton of perks once you get to be the best.