subject to be difficulty.difficulty in understanding.Contrast both of them with details and examples

difficulty comes from the word that the sentences are difficult.mostly students like to enhance the difficulties from the subject and understand the concept of the subject and study and prepare well to spin off the subject.This looks easier but to implement is very difficult.
Firstly if we consider with the tough subjects we are going through we should concentrate on the concept of subject and study explaination of the subject and we should implement them to get best success of it..
thank you