So he went on to post riddles to those whom were considered the wise men of athens like statesmen; poet; artists etc., At the end he found that though everybody "THOUGHT" that they were wiser and knew everything but in reality none of them never really knew a great deal of what they thought they did.
This made Socrates realize that the so-called wise men of athens were incorrect in claiming that they knew everything, while paradoxically albeit he did not know everything and infact he himself knew that he was not wise et all, made him the wiser one than others.
So it doesn matter that if you do not know something but it is very important to understand that do not know it :)
