There are two ways of fingering minor chords on your keyboard:
1) Using the single-finger position (Yamaha), or Casio-Chord position (Casio):
The fingering will depend on which brand of keyboard you own. Here is the fingering for the Gm chord for the two most common types of keyboard.
To play a minor chord on this type of keyboard, press the chord key together with any black key to its left. Any minor chord can be played like this.
To play a Gm chord on this type of keyboard, press the lowest G key with the third finger of your left hand, together with the black key to its left, using your fourth finger.
To play a minor chord on this type of keyboard, press the chord key together with any key (white or black) to its right. Any minor chord can be played like this.
To play a Gm chord on this type of keyboard, press the lowest G key with the fourth finger of your left hand, together with the white key to its right, using your third finger.
If you have another brand of keyboard, check in your owner’s manual to see which fingering should be used.
2) Using fingered chords (suitable for all types of keyboards).
The fingered Gm chord is the same for all types of keyboards. To play the Gm fingered chord, use the first, third and fifth fingers of your left hand.
When changing between the Gm and C7 fingered chords, keep your third finger on the Bb key.
When changing between the G and Gm fingered chords, keep your fifth finger on the G key and your thumb on the D key.
When a sharp or flat sign is written immediately before a note, it applies to the whole bar. E.g., in bar 3 of Minka, all the notes are played as F#, even though only the first F note has a sharp sign in front of it. In bars 4 and 7, there are two F# notes in each bar.