That steady drip you have stopped noticing is nearly always a quick, low-cost repair once someone takes a proper look.
Why it started
Mineral deposits collect on the cartridge and the seat inside the tap until it can no longer close fully, even when you turn it off firmly. Turning the handle harder just wears it out faster. Replacing the cartridge sorts it, and treating the water is what stops it recurring on the same schedule.
In the older homes
Where the supply pipe is galvanised, small pieces of rust break away inside and lodge in taps and aerators. If a tap has been repaired and failed again soon after, the pipe feeding it is often the real cause — and we will be straight with you about that rather than repeating the same repair.
One tap with poor pressure
Almost always the little screen in the end of the spout, and around here almost always scale. Unscrew it, soak it in vinegar overnight, refit it. If the pressure is low throughout the house, that is something else.
Have a look under your sinks
The flexible supply lines and drain fittings fail slowly and quietly, and the first sign is usually a damaged cabinet base. A quick check twice a year is worth doing.