You can begin by writing about what attracted you to this particular fanfiction. Was it the cover art if there was any? Or perhaps a recommendation from a friend? Then move on to your first impressions of the opening paragraphs or chapters.
Sure is! Diary of a Wimpy Kid is a fictional novel that follows the adventures and daily life of the main character. The books have been loved by many young readers.
Start with a quote from the fan fiction that really caught your attention. Then explain why that quote is important and what it made you think about right from the start of your reading journey.