Minor car paint scratches and chips are very easy to repair. These scratches damage the paint layer leaving primer layer intact. Usually, these damages are caused by road debris, branches, or little stones from the driveway.
Compared to small chips and scratches that can be easily fixed with some touch-up paint, long scratches require more work. If you try to brush a long scratch with paint, the surface will look uneven. The best way to repair it is to carefully sand the area and then spray it with touch-up paint.