G sus2/C
The G sus2 chord consists of the G (Perfect unison), A (Major second) and D (Perfect fifth) notes, with C as the bass note.

How to play the G sus2/C chord
- Play C as the lowest bass note in the left hand
- Find G (Root) on the piano keyboard
- Add A (Major second) — 2 semitones above G
- Add D (Perfect fifth) — 7 semitones above G
- Press all 4 notes simultaneously to sound the G sus2/C chord