Apply Teflon Tape to Retaining Nut

What happens here

After identifying the leak, turn off the water supply to the toilet again and disconnect the flexible water supply line from the valve assembly. Use an adjustable wrench to carefully unscrew the leaking retaining nut from the brass valve body. Once removed, ensure the threads of both the nut and the valve body are clean and free of any old sealant or debris. Take a piece of Teflon tape, tear off a length of about 6-8 inches, and fold it in half lengthwise for added thickness. Wrap the folded Teflon tape clockwise around the threads of the retaining nut, making sure the tape seats firmly into the thread grooves. The clockwise direction ensures the tape tightens onto the threads rather than unraveling when the nut is reinstalled.

Goal: Create a watertight seal on the valve's threaded connection