The other one that would be good is (and not wanting to sound like a bit of a pratt) is learning what sort of knife steel needs what type of edge, and how to maintain it. I used to think I was reasonable at sharpening, but after getting into the world of guided sharpening devices I realised I had no idea. The difference now is a blade with an edge that stays good, and if it goes off a lick or two over a diamond steel and it's back running through tomato's etc like it was never blunt.
Prior to the guided devices I was creating a rounded edge I think, which looked mint as but the actual edge of the blade was way steeper an angle than I thought I was putting onto the knife just because I couldn't keep the angle accurately.
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