Notifications are updates to projects you're involved in, and are sent in-app (via the Notifications Icon) and via email, when preferred. Notifications can be set on two levels: project-specific notifications, and global notifications.
To view your notifications in the app, click the Notifications Icon in the top right bar. You can also filter these updates via the Filter Icon. Click into any of the notifications for more detail.
To set your project notification preferences, click the Settings Icon in the top left bar of your project. Select Notification Preferences. Here, select the notifications that you would like to receive. These changes will be automatically applied.