There's no better way to learn how Agile teams operate than to watch them work. Every team works differently because they're always self-organized, making their own decisions as they go. As an observer you can watch how teams work in the real world without any extreme commitment. A lot of Tech Fleet members choose this route because it helps them build their awareness of apprenticeship life and helps them build confidence.
Read all there is to know about observing / shadowing in the Observer Handbook.