Most people do not know the proper way to handle a knife, whether it be in the kitchen or some other everyday use.
I have worked in a kitchen as a chef for 25 years now and it never ceases to amaze me how carelessly people handle a knife; one of the most used and dangerous tools in the kitchen. A knife is not a toy and it should not be used as one. Always respect a knife. It is also not a can, bottle or jar opener. It is also not a screwdriver, as this can cause damage to the tip of the blade and possibly slip and injure the user.
Always hold a knife in your dominant hand. If you are right-handed, hold the knife in your right hand. Likewise, if you are left-handed you would hold the knife in your left hand. You should always have the angle of the blade away from you. Never slice anything in the direction of your body, as you have a better chance of cutting yourself.
Never cut anything while holding it in your hand. Always use a cutting board with a damp cloth underneath it whenever you are slicing, chopping, or dicing. This will stop the board from slipping or moving on the counter top.
Also remember to keep your knives sharp at all times, as a dull knife is more dangerous than a sharp knife. A dull knife will jump or slip off the item your are cutting and possibly cause serious injury to the user. That is why it is a important to own a honing stone or a knife sharpener.
Most people do not know the proper way to pass a knife to someone else. Some people will hold the knife by the blade while others will hold it by the handle. Each of these methods is incorrect. What if someone was to bump into the person receiving or passing the knife, this is an accident waiting to happen. The only proper way to pass a knife to someone else, is to lie it flat on a table with the edge of the blade facing away from the other person so they can pick it up themselves.