Google Calendar

Google Calendar is awesome because it is accessible from any device you use! You can make separate calendars within a calendar (if that makes sense). For instance, if you needed to add you personal appointments and share with family members, you could do that and not have your work events show up on the shared calendar. Google Classroom also utilizes Google Calendar, so all of your Google Classroom assignments show up automatically.

Don't confuse Google Calendar with Outlook's calendar-they are not the same BUT they can be synced!