Shut the water off, replace the cartridge or washer, watch it stay dry
You will diagnose spout drip vs handle drip, shut the angle stops, rebuild a common single-handle cartridge or a two-handle washer stem, and test for 10 minutes before you call it done.
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Spout drip: internal valve. Handle drip: often O-rings. Base: gasket or a loose mount. Watch it for a minute. Take the old cartridge to the store in a bag — brand and model hide under the handle.
Rag in the sink so screws don't vanish down the drain.
Under-sink valves off. Open the faucet to relieve pressure. If stops scream or won't turn, house shutoff instead — forcing a brittle stop is how cabinets flood.
Photo the handle. You want it pointing the same way when you return.
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