1- left side=driver side

The Left side of a car or truck is from the perspective of the driver. Therefore if you are sitting in the driver seat and you look to the left, you will see the Left or Driver side Mirror, door handle, etc. Similarly, if you are sitting in the driver seat and look to the right, you will see the Passenger side mirror, door handles, etc. Therefore on any vehicle, Right and Left is originated from the driver seat!
Left is the Driver Side, Right is the Passenger Side