You might think there are only three gimbal modes, but I think there are really five, now the Extension Rod accessory is available.
In this video I have tried to explain the gimbal modes and what they do in a logical manner, and I hope it will be useful to new users and also interesting to the experts.
I was prompted to produce it because so often I see YouTube reviewers misunderstanding the basics of the gimbal or overlooking some of the modes. Even DJI don't offer much in-depth help on this key topic.