Check out this bada** site I just found: https://scienceofsharp.wordpress.com/
This is the most comprehensive and detailed source of sharpening knowledge I’ve ever found. This guy is an amazing blade sharpener, explains the physics of working metal into scary sharp edges. He takes photos of edges in process with amazing electron and optical microscopes.
On another note: my Blade Sharpening 101 class is coming up on Dec 6 https://calendar.dallasmakerspace.org/events/view/8574
Hope to see y’all there!