Post #2 is absolutely correct. A strong introduction should also provide an overview of the general organization of the paper. If the essay has a thesis, then it should also include what subtopics will be covered.
Then, in your conclusion, be sure to restate your thesis. Like #2 suggested, the conclusion is often a good place to provide fresh perspective, so if you were writing an expository essay, then in your conclusion you could share your opinion on the topic.
Your introduction should prepare your reader for your topic. You might give a little background information to help set the tone for your paper.
The conclusion should give the reader a sense of closure. Don't make the common mistake of simply repeating your introduction. Sometimes a nice conclusion gives the reader a fresh perspective on the topic. You shouldn't introduce new details or evidence in the conclusion.
thank you !! can you please help me with my latrst question of,Ender's Game if you have the chance? Its the question about theme.