Hi, I am a fourth year physics student currently enrolled in a research project course with a supervisor. It's a research in optics and I need to learn about some nonlinear optics. For the report, I want to write about what I have learned during the term, for instance, Rayleigh and Raman scattering, but I just don't know how to write a report. I bought a nonlinear optics textbook to study those and started writing the report. But I noticed that I was just paraphrasing what was written in the textbook and not writing something useful. I tried to explain with more details for better readability but I could not get far from just copying the section in the book. How can I write a good report? Any advise will be greatly appreciated. Thank you. P.S. By the way, the report is expected to be about 20 pages long.