For most of my adult life, one of my problems is having difficulty remembering where I parked. I don't know why. Maybe it's the visio-spatial issue I struggle with, maybe that all parking lots look alike to me, maybe I'm just a moron! No clue, but I have THE DEVIL of a time finding my vehicle in a parking lot. So my workaround for that is to park in generally the same place every time. It won't necessarily be in the same slot, but it will at least be in the same row. When I park somewhere I don't go very often, to a doctor's office for an annual visit for example, I will take one or more pictures of where I parked, with a visual cue that helps me find my car easily. It may be a tree, or some sign, or I'll line up where I'm standing at my car with an aspect of the building and take a picture of that.
What about you? Do you lose your car like I do? Do you have a system?