Make sure you don't miss anything by turning on email updates for important activities
Click your name at the upper right of the screen
Choose notifications
From this screen you can:
Set up a daily digest for your chosen notifications
Check/uncheck activities that you do/do not want to be notified about
Exclude certain courses from your notifications
If your students say they're not getting your announcements, ask them to make sure they haven't opted out in their notification settings.
Review Brightspace's page on changing your personal settings.