What does kidney govern in TCM theory? Explain it in detail. Thank you.

Among the five elements, the kidney belongs to water, which governs the bone, marrow, brain and ears. Five wheels belong to a waterwheel, and five colors correspond to black. Five flavors are salty. Five qi correspond to cold, six fu organs correspond to bladder, seven emotions correspond to panic, and the orientation corresponds to north. The face corresponds to the lips and chin. Kidney storing essence has both tangible essence and intangible essence. People are smart when their kidneys are full. Kidney deficiency, children's developmental retardation, adult waist and knees weakness, fatigue, spontaneous sweating and night sweats. The kidney itself is divided into kidney yin and kidney yang, so the kidney is a house of fire and water. The symptoms of yin deficiency and yang deficiency are different. Kidney is different from other viscera, and its symptom is nothingness. So usually only tonic without diarrhea. Of course, there are also extremely special circumstances, and that is another matter.