As a fan of online literature, I don't have direct experience to judge whether the micro-education in the Ganzhou classroom is credible or not. But generally speaking, online education platforms could provide a variety of courses, including courses related to fictional writing. To determine whether an online education platform was credible, many factors needed to be considered, such as the security of the platform, the quality of the courses, the strength of the teachers, and so on. You can check the platform's reviews, user feedback, comments, and other information to understand its credibility. In addition, you can consider consulting other experienced people such as writing professionals to obtain more detailed information.