After using the same knife for so long it can become dull and lose its sharpness. The following video comes from a channel where they teach you how to make sushi. Because sushi requires very sharp knives to make precise cuts I chose the following video. I also chose it because it’s beginner friendly with the diagrams showing a simplistic way of doing all the steps. The process requires a Whetstone and he shows the Japanese, Western and his way of sharpening.