It can be noisy on Facebook and difficult to see the updates you want to see and when you want to see them.
In Facebook Groups, there is a Notifications drop down box where you can make your selection:
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To get alerted to an update when Notifications are turned on – you will see a red box with a white number in the icon that looks like a globe in the upper toolbar. You can also have notifications come to your email or text message inbox by setting your preferences in Settings/Account settings/Notifications.