Maybe time to consult the highway code. It clearly recommends when parking.
1. Park close to the kerb and apply the handbrake firmly
select a forward gear and turn your steering wheel away from the kerb when facing uphill
2. Select reverse gear and turn your steering wheel towards the kerb when facing downhill
3. Use 'park' if your car has an automatic gearbox.
When being taught to drive I was always told to leave the car is gear when parking.
See link below