Learning rotation is important and there are lots of Taubman videos on YT that explain it in detail, usually with scales.
In a nutshell, there is the concept of single rotation and double rotation. When finger-to-finger movement is in one direction, like 1,2,3, you use double rotations. When going from 3 to 1, a single rotation. The movements are highly exaggerated for learning and demonstration.
I think it's easy to get hung up on "how can I play piano if I'm rotating my hand all over the place?" In my opinion, a large part of learning rotation and how to use it for slow practice on difficult passages is about freeing your arm and hand so they are not unintentionally opposing movement. Playing with tension or unintentional opposition, especially if you play hours a day, is one way to get RSI (tendonitis).
Here are some excellent YT resources for piano I have bookmarked. Several of these have videos that talk about forearm rotation:
I think it's very interesting and there's a lot to be gained by working on it (which I'm actually starting to do). The hardest scale in piano is C major probably, or at least one of the hardest ones... just started with Taubman, but C major (and D major) are sounding way better, even with what I would say is not a huge time investment.
There's very good teachers doing zoom lessons these days. And I think Taubman technique is the sort of thing that you'll need a teacher so that the concepts can be applied to how you're playing. Start here https://www.golandskyinstitute.org/faculty-of-the-golandsky-...
In a nutshell, there is the concept of single rotation and double rotation. When finger-to-finger movement is in one direction, like 1,2,3, you use double rotations. When going from 3 to 1, a single rotation. The movements are highly exaggerated for learning and demonstration.
I think it's easy to get hung up on "how can I play piano if I'm rotating my hand all over the place?" In my opinion, a large part of learning rotation and how to use it for slow practice on difficult passages is about freeing your arm and hand so they are not unintentionally opposing movement. Playing with tension or unintentional opposition, especially if you play hours a day, is one way to get RSI (tendonitis).
Here are some excellent YT resources for piano I have bookmarked. Several of these have videos that talk about forearm rotation: