
Understanding Shutter Speed
Shutter speed controls how long your camera's sensor is exposed to light. In motorsport, fast shutter speeds (like 1/1000s) freeze the action, but slow shutter speeds (anywhere from 1/30s to 1/4s or even slower) allow you to capture motion blur, which gives a sense of speed and direction. As you may have guess, the longer the shutter remains open, the harder it is to get your subject sharp, therefore it is widely recommended when starting to practice with faster shutter speeds and gradually work your way slower. At the start of any day at the track, I will start between 1/60th-1/125th of a second to get my eye in. For me once I start getting around 40% plus of my images relatively sharp, I will reduce my shutter speed by 50% (e.g. 1/60th > 1/30th or 1/30th > 1/15th) and start the process again.
Shutter Speed Examples
Below are some examples of how different shutter speed may influence your images.

1/100th
At 1/100th you start to get some background blur. Busy background remain distracting and you are not fully isolating your subject.