Start with a close position chord, then take the second note from the top and drop it down one octave. The result is a wider, more open voicing that spans both hands. Drop 2 voicings are the bread and butter of jazz guitar but equally powerful on piano for right-hand comping or chord melody.
Take any close position voicing [1, 2, 3, 4 from bottom]. Drop note 3 (2nd from top) down an octave. Result: [3-12, 1, 2, 4]. Four inversions possible.
For right-hand voicings over a left-hand bass note. In chord melody arrangements. When you want a wider, more transparent sound than close position. Drop 2 gives you four inversions per chord — practice all four to cover the full keyboard range.