What is the best way to brainstorm?

Although I wasn´t in class the last lesson, when this methods were explained and practised, I have thought about the question we have to answer in this essay.

First of all, I have to say that before I always used the freewriting when I had to write an essay but when I discovered the other ones I realized this method isn´t always the most adequate because it is more risky than the others due to it can make you go wrong if you aren´t inspired.

After thinking about freewriting and in conclusion, I realized that the best method is mapping because it allows you to make first a plan, a kind of "map" with a main topic and around it another subordinate topics that are surrounded by other secondary topics, so the ideas are in order of hierarchy and importance.