Depending on your settings, your activity feed will contain notification events from your catalog and network events. To learn more about controlling which events appear in your activity feed, click here.
In your catalog, you'll see a bell icon in your toolbar. When you have new notifications, you will see a red number reflecting how many new / unread notifications you have.
Click the bell icon to see the notifications drawer where you can perform a few different actions.
If you've been shared on an asset, you will be able to click on that asset to view it.
You can also mark individual or all notifications as seen so they're not displaying as new notifications anymore.
You can click the settings wheel icon to update your notifications settings.
You can click View all activity to see your entire list of notifications from the past 90 days.
While viewing all activity, you can choose what events you want to see by clicking the checkbox beside the options for "Show evens from:", as seen below. You can filter your activity feed events by: Catalog, Pitching, and Network: