Notifications
What AODex tells you about, and how to keep the list under control.
Notifications appears in the navigation when you have something unread, with a count on it.

Reading them
Open the list to see everything. Mark all read clears the badge without deleting anything; an individual notification can be deleted outright, confirmed with Notification deleted. An empty list reads No notifications.
Controlling them
Control when and how you receive notifications in your account settings. This covers what AODex sends and through which channels.
On a phone, whether AODex Notifications may reach you at all is an operating system permission, granted outside AODex. If you have allowed them in AODex and still see nothing, check the system settings for the app.
What you will hear about
Notifications are for things that happened while you were not looking — work that completed, something shared with you, account-level events. Day-to-day conversation activity is not pushed at you; it is simply there when you return to the thread.