The reflections can be about what you found new, intriguing, puzzling, etcetera, for the assigned reading in the textbook, assigned videos, and assigned articles. The journal reflections can also be about what you found interesting in some of the classmate’s “post” comments, and any additional suggested sources (URLs, books, articles) related to the topic(s) covered in a module.
Book: Schrum, L., & Levin, B. (2015). Leading 21st-century schools – Harnessing technology for engagement and achievement (2nd ed.). Thousand Oaks, CA: SAGE Publications, Inc.