Literally…for maximum tuning stability on a stringed instrument such as a guitar (acoustic or electric) or bass, approach the final in-tune pitch from below.
If you tune a string down, it’s likely that there will be extra slack caught in the string, and when it releases, the string will end up tuned flat.
If you tune up and overshoot a string’s target pitch, drop it back below the target pitch and come up from below again.