Scalloped or serrated edges usually require professional attention and the following method does not apply to them. There are two basic tools needed for knife sharpening. A steel is a long, round rod of metal with a handle on the end. It is used to maintain the sharp edge between times the knife is sharpened with a stone. There are one-step knife sharpener available on the market.
Problems arise when uneven pressure is applied to the blade.
That creates waves which damage the blade. An electric sharpener removes too much metal and often causes waves. Basically, you'll find sharpening stones at hardware stores, or stores that carry hunting or sporting supplies. You'll find a larger stone will make it easier to sharpen most of your knives. It is important to maintain the angle between the knife blade and the stone.