If you're wondering how to spy on someone inside their car, there are a few things you'll need to do. First, you'll need to find a good hiding spot where you can see into the car but the person inside can't see you. This might be somewhere high up, like a building or tree, or it might be lower down, like behind a bush. Once you've found your hiding spot, you'll need to use binoculars or a telescope to get a good view of the inside of the car.
If you want to hear what's being said inside the car as well as see what's going on, then you'll need to use a listening device. These can be bought online or from some electronic stores. You could also try making your own listening device using items like a paper cup and some string. Once you've got your listening device set up, all you need to do is sit back and wait for the person in the car to start talking!