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The absolute best way to ruin a screw head or a screwdriver is to use the incorrect driver for the screw. The easiest way to avoid it, is to have a good selection of drivers with you to choose from.
You may use one or two of them 80% of the time, but every time you reach for one of the others, you will have avoided damaging one of your favourites.
In most cases there is also a price advantage in buying a set rather than individual screwdrivers.