How to use a screwdriver

Align the specially shaped tip of the screwdriver with the dimple on the top of the screw, secure it, and start turning the handle.

According to the specification, turn it clockwise to tighten it; turn it counterclockwise to loosen it. (In rare cases the opposite.)

Slotted screwdrivers can be applied to Phillips screws. But the Phillips screw has a strong ability to resist deformation.