Why are the golden rules in chess openings true? I was reading this Dutch article on chess openings, which basically states the following about openings:


Don't play the edge pawns 
Don't move your knight to an edge
Don't use one piece too often
Don't use your queen too soon


And the 3 golden rules:


Move pawns to the center
Develop your knights and bishops early-on
Castle to keep your king safe


I understand most of these, but not all of them, these are my questions:


Shouldn't you move your knight to an edge because of the opponents bishops?
Edge pawns shouldn't be played because they don't remove any obstructions?
Why shouldn't you use your queen early-on?
Indeed, these rules seem to me being golden rules!


  
  Shouldn't you move your knight to an edge because of the opponnents bishops?  
  Edge pawns shouldn't be played because they don't remove any obstructions?
  


In chess opening, the main idea is to develop your pieces and control the center of the chessboard. In order to control the center, moving your knight to edges is not accurate move. Same reason for edge pawns. For example, moving your knight on f3 permits to control d4 et e5 squares.


  
  Why shouldn't you use your queen early-on?
  


Moreover, moving a queen early-on can be dangerous because this piece must support other pieces at the beginning of the game. And queen is kind of protected if it is behind the other pieces and not attacked by your opponent pieces development.
However, several openings play queen early and work well (Scandinavian Defense for instance).