Usually these are the fingers that are used:
(for the right hand)
ROOT - 135 (thumb, middle finger, pinky)
1INV - 125 (thumb, second finder, pinky)
2INV - 135
That's usually the way a classical teacher would show you. Sometimes I deviate from these, when the next chord or key I have to press is distant.
The left hand is the same the numbers are just backwards.
:wink: