Steps:
Turn Off Water Supply: Locate the shut-off valves under the sink and turn them off to stop the water flow.
Close Faucet: Close the faucet handles to ensure there's no water pressure when you work on it.
Remove Handles: Use a screwdriver to remove the screws holding the handles in place. Set the screws aside carefully. Once the screws are removed, lift off the handles. They may be secured tightly, so you might need to gently wiggle them to loosen.
Inspect Washers or Cartridges: Once the handles are removed, inspect the washers or cartridges. If you have a cartridge faucet, you might need to replace the cartridge itself. If it's a washer-type faucet, you'll need to replace the washers.
Replace Washers or Cartridges: If you have a washer-type faucet, replace the old washers with new ones of the same size. If it's a cartridge faucet, replace the cartridge with a compatible replacement. Make sure to follow the manufacturer's instructions.
Apply Grease: Apply a thin layer of plumber's grease or silicone grease to the new washers or cartridge before installing them. This helps ensure a smooth operation and prevents future leaks.
Reassemble: Put the handles back in place and secure them with the screws. Make sure they're aligned properly and tighten the screws securely.
Turn On Water Supply: Once everything is reassembled, turn the water supply back on and test the faucet for leaks. If there are no leaks, you've successfully fixed the issue. If there are still leaks, you may need to double-check the installation of the washers or cartridges and ensure everything is tightened properly.
Adjust as Needed: If the faucet still leaks, you may need to adjust the handles or other components slightly to ensure a proper seal.