For most of California's 10 million K-12 and college students, the beginning of March marks one year of learning online. Though a return to in-person instruction is now on the horizon for many as the number of new Covid-19 cases drops and millions receive vaccines, the last year for the education community has been characterized by anxiety, disruption, reckoning and uncertainty. Here's a glance through key milestones over the past year, and EdSource's reporting about them.