Please tell me how to choose a parking spot in Athens?

Interested in the signs under which parking is strictly prohibited, what kind of signs indicate paid parking and where to pay, and which signs indicate free parking.

@Aleks: You can park on the free parking spots if there are absolutely no items in your car.

@Grigoriy: try to find a paid parking lot

@Grigoriy: And what about this?

@Mir: Paid, guarded. And do not leave anything in the car in plain sight, also a tip to open the glove compartment.

@Mery: Here, we see the same thing as you.

@Mery: This is a very useful comment, while there was a fear of getting a parking ticket, but when you see that everyone does it, it confuses you.

@Mir: Yes, the main thing is not to park where there is no one. It can be dangerous... I mean if no one has parked there and there is a no parking sign, then you shouldn't either. )

@Mir: We received a fine for parking, even though my husband supposedly left the car in a permitted free space.

@Valeriya: How much?

@Mir: I don't remember, something around 50€, like 3 years ago.

@Aleks: In Athens, everyone parks as they please. No one really follows the signs, they can park in the second or third row. In the center, there are paid parking lots, I tried to find them but couldn't (not to be confused with paid parking spaces). The only thing I discovered is that in the center, almost everywhere there are parking spots for local residents with permits. But I didn't know this earlier and calmly left the rental car there several times. Nothing terrible happened.