Open one of your different photos in Lightroom and make shadow adjustments to this photo.
You should have 4 photos for this assignment.
Each photo will have a caption underneath the photo. (See my examples and do the exactly the same thing.
Photo 1 will be the original photo with no adjustment.
Photo 2 will be with too much shadow adjustment. (Shadows too open and too much detail in the shadows.)
Photo 3 will be not enough shadow adjustment. (Shadows will be too dark.)
Photo 4 will be the just right amount of shadow adjustment.
If you do not know/remember how to do any of these assignments, find someone near you in the class that remembers that can help you. One of the 3 standards in class states that you need to be a problem solver when I am helping another student or not available.