Each gear in a car has its own purpose. When you're driving, you need to be able to use the right gear for the situation you're in. For example, if you're driving on an open road, you would want to shift into 3rd gear so that you can cruise at a comfortable speed. However, if you're driving around a city, you might want to shift into 1st gear so that you can get through tight traffic quickly.
There are also times when you may need to shift into a different gear to avoid getting stuck in a particular situation. For example, if you're navigating a snowy roadway and want to stay on the road, you might need to shift into 4th or 5th gear so that your car can climb over hills and navigate dangerous turns with ease.