The best way to link you introduction to your conclusion is by restating your Thesis Statement in the conclusion. Your Thesis Statement is a sentence that states what you are claiming (what you wish to prove in your essay). Simply restate it in different words to tie your essay together. Then leave your conclusion with a thought provoking clincher, like " So you can see, there are many answers to a questions but you must decide what the right answer is for you."
Hope this was helpful.