Probably my question is quite difficult because native speakers rarely think about the things I'm wondering about, but for me as a learner it's really necessary to understand all this in ordrer to sound natural.
Imagine I were standing near the place intended for leaving a bicycle before going to the park. A person approaches me by bicycle and ask where he can leave it. Showing the right place I say:
"Please leave it here" In the example(s) you used, you would not usually use "please" unless you were in charge of/responsible for the parking area. You could say, in your example, "You may leave it/park it here".
"Please leave it right here" "You may leave it/park it right here" (in the immediate area of where you are).
"Please leave it over here" "You may leave it/park it over here". (if the person is some distance from you and the parking area is where you are.)
Which option is correct and what do "right" and "over" add to the location of the place that I'm pointing at with my hand when answering the question?
If the place for leaving bicycles were not near me, but a bit farther (visible, though) would I need say
"Please leave it there" (If you would indicate the location.)
"Please leave it right there" (Where the person was located at the time.)
"Please leave it over there" ( At some distance from you.)
I really appreciate your help