Open chords are pretty simple to understand. They're basically notes in a chord that you don't play or finger.
Closed chords are notes of a chord that are stacked on top of each other (vs. open chords, where the notes are apart from one another).
If you'd like to get better at your piano playing or even guitar playing, check out this music theory tutorial for a lesson in open chords, closed chords, and note doubling.
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