What exact info was provided to the public from the whole "wikileaks" incident?

I have been doing some research about the whole wikileaks incident, All I know so far is something about the U.S.-Russia secret meetings made public, and Iran/korea Missile development. What else is there to know about this, I have skimmed through New Yorker and other article's coverage on the story but I don't know how much I could trust those sources on an issue like this, because those are interpretation and summaries not first hand info straight to me. Have anyone actually saw the wikileaks' releases first hand.