What is the most important position in the NFL?

Hello everyone!

As a european fan I am trying to get to know and learn how the NFL works. I like watching the highlights posted on YouTube by the official channel. I don't fully understand the game but I like it.

Right now I don't have a favourite NFL team but I am still looking for one.

So, what is the most important NFL position in your opinion and why?

Let me know what you think. Thanks!