It's easy to explain someone how football works in 10 or so sentences.
But in just one sentence?
Because you'd have to prioritize.
You'd have to decide what could be left out.
And what has to be in it.
Ultimately, the more things you'd have to leave out, the better you'd have to know the game.
Because that's the only way to know what's important and what's not.
Knowing the game and what you're talking about...
At the end of the day it's not about how much you say.
It's about how much you're able to say, write or do by saying, writing or doing as little as possible...
P.S. Of course, this doesn't apply to football only. It applies to pretty much everything.