Treat it with great respect for if you use it the wrong way it can hurt you. Make sure that mom or dad shows you how to use a knife, and let them cut and chop until you have become quite comfortable working with a knife. Let mom or dad help you find a knife that is just your size. It shouldn't be too big or too small and it should feel comfortable and balanced in your hand. It is used for cutting, chopping and slicing all the ingredients necessary for a recipe.
Knives come in many different sizes.
The paring knife has a short, straight edge for a cutting blade while the serrated knife has a wavy cutting blade. I prefer you use the serrated one because it doesn't slip off as easily, but straight-edged knives are better for chopping. There are two important things you will need to do while using your knife. If you are chopping food, go very slowly and hold the food with your fingers curled under. Oh, I almost forgot, always use a cutting board.