It basically means you can't use cards like Reanimate to play things from the graveyard, recast creatures that are in the graveyard like Reassembling Skeleton, or use cards that pull directly from the library to the battlefield like Nissa Revane's +1 ability.
February 6, 2017 8:35 a.m.
Creature cards in graveyards or library can't be put directly onto the battlefield, and any card in graveyard or library can't be put onto the stack, putting them in your hand through drawing or other means is perfectly fine, and putting them onto the battlefield or stack from your hand is fine.
February 6, 2017 9:57 a.m.
In general, Magic has very specific wording. Effects do what they say; no more, no less.
If something affects your draws, it will use the word "draw." In this case, the effect only mentions entering the battlefield and casting, so those are the only two processes affected.