Using the car-behaviour you can make a sprite move like a car.
Make a track, put the car-sprite on it make an event to scrollto car.x, car.y and you can race along the track.
And there you have it, a simple car racing game.
If you want to do more than that, you should learn more about how Construct 2 works with conditions, events and variables. The best way to do this is follow the tutorials (even if they are for making a totally different kind of game), learn from the free examples you got with construct 2 and make lots of mistakes and correcting them.