Polarizing filters do allow you to cut glare except from metal objects so you can often see through a window properly or below the surface of water. To my mind the best use is to remove glare from foliage and such like in a landscape which increases saturation. Also darkens a blue sky particularly if you are shooting at right angles to the sun. The effect varies depending on the quality and direction of the light. Best avoided with a wide angle lens as a blue sky can end up looking blotchy with different parts of the sky varying in saturation. Fun but I would not bother with one until you have more of the basic equipment and more experience.
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