When you leave the car, at least for a while, surely take out a key from the ignition lock. It is especially important when in the car there were children. They can start the engine or turn on some electric device.
Take out a key from the ignition lock only after a full stop of the car, otherwise steering blocking can join on a code.
||To the car the main and additional keys are given. The main key opens all locks. The additional key does not open only locks of a luggage carrier and a ware box.
The additional key should be used only when the usual key temporarily got lost or in general it is lost.