Have a read here , the info your looking for is a bit of a way down the page https://www.carbibles.com/car-steering-systems/ Andi
Steering angle is how much you turn your steering wheel. Steering lock is how much your car's front wheels turn from neutral to lock. (I don't know where you can find steering ratio value shown in this game, but I don't think it's necessary when you have the other two values.)