All these format types are appropriate for certain types of content. It is important to note that although the prepared templates make the writing easier, the decision on which template to use is still up to the writer. If you are having problems choosing which one fits your topic, you can browse through past articles and see how each template has been used before.
The body of your work will be the main part of the article or writing assignment. You have to write the main points of your argument logically-from the strongest points to the weaker, from what happened first to last, or from the most important to the least important. This is your opportunity to shine, or fall completely flat, as a writer. Shining is good, falling, well, not so much.