FRIENDS, STATIC, GLOBALS

these 3 things i've been told to never use, Globals I can kinda understand, but static and friends...? wtf

ok, i'll try to make it simple for op

class Dice{
  private:
  int face;
  public:
  Dice(){srand(time(0));rolar();};
  static int FACES=6;
  int obtainFace();
  void roll();
};

int Dice:obtainFace(){return face;}
void Dice::roll(){face=rand()%FACES + 1;}

Every time you create a new Dice you create a new int "face", but you don't create a new int FACES, that's because it's static, it belongs to the class and not to the instance.