Big data in education has the potential to disrupt existing systems through personalization, evidence-based decision making, and continuous innovation. However, it also poses threats such as privacy issues, oversimplification of learners, and reducing the role of teachers. Learning analytics uses data from online learning platforms to provide insights into learning processes. Examples from Tallinn University include an open educational resources platform and a tool for visualizing pedagogical scenarios. Policies are needed to ensure the ethical use of student data and learning analytics.