Blunt knives cause most kitchen injuries
The angle
About fifteen degrees a side for a kitchen knife, which is roughly two stacked coins under the spine. Consistency matters more than precision.
The burr
Work one side until you can feel a slight lip along the whole edge, then do the other side. Feeling for the burr is the actual skill.
Finishing
A few very light passes alternating sides, then strop on a leather belt. Ten strokes is plenty and more is worse.
