Essay is your own point of view on something you have heard, read, seen etc. The forefront of the essay is your personality, your thoughts, feelings and your life position. You have a unique chance to enter a reasonable controversy with other authors, as the teacher expects you to show your erudition in the subject. However, you should remember that regardless freedom of the writing process, it is not that easy at all. Because you are expected to find an original and capturing idea (even in the traditional context) and exceptional opinion on some problem.
The title of essay does not strictly depend on the essay topic: the title can also serve as a starting point in your reflection; it can express the relation of the whole and the parts. A free composition of essay is subject to its inner logic, it is an emphasized position of the author.