To write an argumentative essay, you should. Firstly, choose a topic according to your interest with broad points to talk about and argue, do research as per the topic and gather the most valuable, relevant and important information to prove your point, like evidence and examples, and then write it down professionally while focusing and proving your point. Usually, students asks professionals how to write an argumentative essayto ensure that it is flawless and perfect as per the requirement. After the writing is done, the next step is to edit and proofread and make sure that the essay is as per the requirements of the teacher.