My kitchen water tap starts to drip even after fully closed it. When I went to hardware shop they told me that a problematic cartridge might cause the water dripping.
Unscrew The Water Tap Handle
Usually the screw is hidden at the handle and it is of hex socket.
Remove the Cartridge by Turning Anti Clockwise
See whether The Cartridge Has Problem or No
Mine as you can see there is a small gap.
Replace it With New Cartridge
You can get the cartridge at RM12.90 and the cap around RM8.
You also can buy the cup and cartridge at Shopee or Lazada. Ensure you choose the right size.