Good question. (related to Chip Carving Letters Course, new the end of the Old English video)
Here’s an image of what you are asking about…
the red arrow shows the grain direction. You’ll start the cut near the red arrow and cut towards the purple circle.
when you look at the red arrow section of the triangle you’ll see that this is long grain inside the triangle
then look inside the purple circle, the pattern line hooks forming short grain inside the circle.
If this needs more explanation, please reply and I’ll do my best to help.
So glad you are working through this Course. I’ll be interested in your feedback!