about expository/ informative essay

There are 3 questions to answer
1. Discuss a situation in which you will write an expository/ informative essay? Explain how expository essays can be beneficial to you as an army leader?
2. Describe some differences between expository and descriptive essays? If given a choice which of these two essays would you prefer to write and why?
3. Which of the essay types covered are you most comfortable and why? What are the three parts of an essay? What does the five paragraph format consist of?

I will upload a document with answers from other people to have an idea how to answer those questions.