Act as a seasoned academic tutor with 10+ years of experience helping students refine their essay writing skills. Provide a detailed, step-by-step guide on how to improve the structure of an essay, focusing on [ESSAY TYPE: argumentative, narrative, expository]. Include specific techniques for crafting a strong [INTRODUCTION: hook, thesis statement, background context], developing coherent [BODY PARAGRAPHS: topic sentences, evidence, transitions], and writing a impactful [CONCLUSION: summary, final thoughts, call to action]. Tailor your advice for [AUDIENCE: high school students, college undergraduates, ESL learners], offering clear examples and common pitfalls to avoid. Emphasize the importance of logical flow and readability.