Questions like this irritate me because the OP spends more time himself than if they had just read some MongoDB introductions. (Never mind the effort that others are spending on his behalf.) It seems to me that these questions are lazy and trying to get other people to do his homework for him.
I'd like to see a Vote to Close option of "Easily discoverable information".
It's one thing to say "I went through some docs and "
"They didnt' make sense to me. [Follow-up Question]"
"I couldn't find what I'm looking for. They say this, but what about that."
I could be (rightly) accused of being lazy in many ways. I want to help people, but this kind of laziness makes me want to send a LMGTFY link.