For a dripping spout, replace the inlet seals and springs or the all. Cure any leaks around the spout sleeve by replacing the O-rings on the faucet body. Usually, leaks occur because of worn O-rings or a faulty cartridge. Look at the O-rings on the faucet body. If the cartridge is worn, replace it with a duplicate.
Cartridges vary, so read the manufacturer's instructions before installing a new one.
The most common type has a flat side that must face front. Otherwise, the hot and cold water supply will be reversed. Be sure to fit the retainer clip snugly into its slot.