 Shut off the water supply to the faucet to prevent water flow during repair.  Remove the faucet handle by loosening screws or prying off decorative caps.  Disassemble the faucet to access internal components such as cartridges, washers, O-rings, springs, or seals, depending on the faucet type (compression, cartridge, ball, or ceramic disk).  Inspect all parts for wear, damage, or mineral buildup; clean or replace faulty parts like washers, O-rings, seals, or cartridges.  Apply plumber’s grease to new or cleaned parts to ensure smooth operation and prevent leaks.  Reassemble the faucet carefully, ensuring all components are aligned and seated properly.  Turn the water supply back on and test the faucet to confirm the leak is fixed and no water drips remain.  Tighten mounting hardware and supply hoses if necessary to secure the faucet and prevent leaks at the base or connections.