Hammering nails seems like such a common skill. Yet we all must admit that when it comes to those first few strikes of the hammer, it's hard to hold the nail perfectly perpendicular to the slab of wood. This means we often hit our own nail or knock the nail we're hammering off course.
This is where cardboard comes to the rescue. Check out this video to learn how to use a slice of cardboard to hold the nail in place.