general relativity - Is a black hole really connecting two parallel universes?

1. 
   

   What is beyond the point of singularity in a black hole and universe expands in all the three $x$, $y$ and $z$ axis?

   
   


2. 
   

   So how can one thing be on top of another when we don't know where the end point of the things is?

   
   


3. 
   

   And how does a black hole connect two parallel universes?

   
   


4. 
   
   

   And if there is another universe then is there another milky way, solar system and Earth?

   
   


5. 
   

   And how does a black hole connect them?