While staying abroad many consumers chose to rent a car, as it can be very convenient to have your own car. Usually cars are booked beforehand on-line, so the same rules apply as usually when making on-line purchases. Check for details about the trader on his website, see what others have to say and so on. However, the right of withdrawal doesn't apply when booking a car on-line so you don´t have the right to cancel your booking without any reason or cost.
For more details please read on – but to start with there are some basics to keep in mind:
Read the contract – even the fine print!
Make sure you know how much you will be liable for in case of an accident.
Make sure you inspect the vehicle carefully with a car rental company employee present both when picking up and returning the car.
Before leaving after returning the car, request a written statement that the car was returned undamaged.
Also you need to familiarize yourself with the traffic rules of the country where you are staying.