What angle should I sharpen my knife at?

Here's the short answer: Sharpen Japanese knives at 15º each side, Western knives at 20º each side and meat cleavers at 25º each side. But there's a bit more to it than that  The angle you hold the knife at to the whetstone is called the ‘edge angle’. A shallower edge angle means a sharper knife but a more delicate.
One of the most important things to get right with knife sharpening is the angle you sharpen at. But edge angles aren’t quite as straightforward

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SENKEN 3-in-1 Kitchen Knife Sharpener, Adjustable Angle from 14 to 24 Degrees for Japanese & German Knives, 3 Stages for Sharpening & Honing, Includes Slot for Scissor Sharpening & Serrated Blades