Final answer:
A main closing technique is to summarize the key points and reinforce the overall essay, creating a memorable conclusion.
Step-by-step explanation:
One main closing technique discussed in the referenced book is to create a closing section that is both memorable and effectively sums up the main points of the essay. This technique involves reinforcing the journey the reader has taken through the text by summarizing the key arguments or points presented. An impactful closing can leave a lasting impression, ensuring that the thesis and main arguments remain with the reader. According to the book, it is beneficial to try out different closings and possibly seek feedback to refine the final paragraph, ensuring it delivers a strong conclusion to your argumentative research essay.