How can you save leftover keg beer?

To save leftover keg beer, first, ensure the keg is properly sealed to prevent oxidation. Store the keg in a cool, dark place, ideally at a temperature between 34°F and 38°F (1°C and 3°C). Use a CO2 tank to maintain pressure and keep the beer carbonated, which helps preserve its freshness. If possible, transfer the beer into smaller containers to minimize exposure to air.