Initially the team picks user stories based on their past experiences or an educated guess. These could go wrong also, since they're just assumptions. And since agile follows the principal of progressive elaboration, as the project progresses the requirements will become much more clear.
@@EduHubSpot Actually I have not applied to any course of the eduhubspot . I just keep on studying with the RU-vid videos of eduhubspot. So I cannot email any mentor.