Using the Arduino reference page as a starting point, research the basics of how to use pulse width modulation (PWM) on the Arduinos.
For this activity, you will wire up a potentiometer so it controls the brightness of an LED.
From the relevant page on the Arduino website you should be able to find enough information to wire and program this activity yourself.
This activity is simply adapted from the LED Dimmer activity, but you will be using the light sensor in place of the potentiometer.
Note that the light sensor input will have to be “scaled” so that when the sensor is covered (dark) the LED will fully lit and when it is uncovered the LED is fully off.