If you have any questions about this survey you can read the FAQ here:
https://www.ygender.org.au/trans-healthcare-reviews/faq In this survey the practice is the place where you accessed medical care- it might be a hospital, community health centre, doctor's office, etc.
The practitioner is the medical/healthcare professional you saw- that might be a doctor, or specialist, or psychologist, etc.
The staff refers to other staff you interacted with, e.g., receptionist, nurses, etc.