The route which you choose to climb on the rock face is crucial, because you want to climb to your ablity and experiance. Also some people are more comfident then other.  Some parts are too dangerous for a beginner  to or even for the most experienced climber it can be dangerous.

Communication between the belayer and the cimber is really important becuase the climber is in the hand of the belayers. If the belayer isnt watching the climber and they are not listening, the climber could be put in a dangures passions. For example oif the climber is shouting down to the belayer about the rope being slack and the belayer is not taking any notice the climber could falls to the floor or even so far that when they stops they will fly into the wall and really hurt them selfs or even worse kill them selfs.