The keys people usually struggle with
- The number row, because the fingers have to leave the home row and most people never drill it.
- Shift and capital letters, particularly when the same hand tries to do both.
- Punctuation on the right-hand little finger: semicolon, apostrophe, slash and brackets.
- Letter pairs that share a finger, such as E and D, or I and K.
- Missed spaces at the end of short words when typing quickly.
If the same finger keeps appearing in your report, revisit proper finger placement - the fix is usually posture rather than practice volume.