Notifications brings you intelligence about the system, tasks you need to undertake, and alerts. If you have an unread notification, there will be a red circle next to it in the left sidebar with the number of new alerts. You are able to filter the list for what you care about the most by selecting the Filter pulldown in the upper right. Pin messages with the pin icon. You can also clear individual notifications with the three dots or all of them with the “Clear all” in the upper right.