How can I get an alert when a new topic is posted?

On each group page, you’ll find a new section on the right hand side called “Group Watchers”.

Add yourself as a watcher if you’d like to get alerts for every new topic posted in the group (you won’t be automatically subscribed to every thread – this will only happen if you add a post to the thread as usual)

This feature can be useful to groups in which there might need to be multiple caretakers:

If a caretaker is going away on holidays, then other folians can “watch” the group until they return for them (without the need for the caretaker to remove themselves from the group)