How to use a polarizer when taking photos?

Polarizers are specially used to eliminate or reduce polarized light, and only have an effect on non-specular reflections, because the vibration of light waves in the light produces polarized light, which will produce reflections on the object, causing the color of the object to change. , eliminating polarized light through a polarizer can make the sky bluer (only in the sky that is in a certain arrangement with the sun), the leaves greener, that is, the color is more saturated, or the reflection on the glass can be weakened or disappeared, etc., but It has no effect on the reflection of metal surfaces. In addition, many people think that just adding a polarizer can make the colors more vivid. This is a wrong understanding. If there is no polarized light, it will not have any effect if you have to use a polarizer. It just adds a neutral density filter (polarized light). The mirror can function as a neutral density mirror). Polarizers are divided into wired polarizers PL and circular polarizers C-PL. The latter can be used more conveniently on autofocus lenses. There are also colored polarizers, which can produce color changes by rotating the lenses. Two polarizers are superimposed. It can also produce special effects, which can simulate night effects during the day, and can simulate fade-out and fade-in effects when used in photography. Special reminder: Only laymen should think about the role of polarizer through PS, because it will make your work lose a lot of detail levels.