In this great video from Jensen Fly Fishing, Dave explains how to fish the pool below a sharp bend in a river. In this video, he explains how to break down and fish the upper part of the pool, from the seam along the inside edge, to the rocky run, to the head.

https://www.orvis.com/fly-fishing
https://news.orvis.com/fly-fishing
http://flyfishalberta.com/jensenflyfishing/

Also look at:
http://flyfishing-blog.com/flyfishing-blog.com/2020/09/29/orvis-how-to-fish-a-streamer-in-a-shelving-riffle/
http://flyfishing-blog.com/flyfishing-blog.com/2020/09/12/orvis-pro-wader-fabric-and-construction/
http://flyfishing-blog.com/flyfishing-blog.com/2020/08/11/orvis-how-to-fish-woolly-buggers-in-rivers-part-iii/