The reason for turning the wheels to the left or right is for safety, which means in case the car rolls

It can stop at the borders of the sidewalk or the edge of the sidewalk so that it does not roll forward or backward and cause a dangerous accident or danger to people’s lives.

If you park your car on a downhill or low road
 In this case, you must place the tires to the right

Example of tire position when parking a car on a low grade road

The reason for this is the possibility that the car will slide or that someone will hit you from behind
 Since you put the tires towards the right, the car will stop using the front tire
 Which will be based on the edge of the sidewalk in order to avoid the car moving towards traffic or pedestrians.

And if you are on the way up (flight)
 You must turn the car’s wheels to the left towards the road

An example of the tire position when stopping on an uphill road

The reason for this is that if the car slides or someone collides with you from the front
 The car will roll or move backwards, not forwards, as it is on an uphill road. The car will stop using the tire that will rest on the edge of the sidewalk.
 Therefore, the car will not slide or move backwards towards traffic or pedestrians.

If you park your car on a straight road, point the tires straight ahead.