I learned that learning is not just learn more and more, we should step by step. And if you have the second barrier, you have to go back to find out what you thought you understood well just before you got all confused. The third barrier is misunderstood word. If you have the word you did not understand, you may have like feel blank, tired, not there and you might have feel worried or upset. And I will tell how to solve the problem. First, you have to find what you do not understand word ,and search the dictionary that you do not understand word ,and make up sentences ,and restudy the book. All of this I write is I learn and from the learning how to learn.