Knives can be sharpened in a variety of ways, and it depends on which material is used to sharpen the knives. If you are using a sharpening stone, the knives should be sharpened at an angle of 10-15 degrees to achieve the best results. If you are using steel, the knives should be moved side by side to sharpen them properly. It is advised to use textured steel if you are a beginner, as the polished steel can ruin your knife if not used properly.