For this task, to make a rectangle, I hold the Shift key and dragged down using my mouse at the same time to keep the proportion, then you can make a perfect square.
The moon shape, I used Elliptical Marquee Tool, hold shift to make a perfect circle. Then pressed command + T to select the shape and moved a little bit to change the shape.To make a variation types of shapes I used Lasso Tool. After drew the shape, I clicked Delete. To fill a space, go to edit, fill, select colour and pick a colour to fill the shape.For this exercise, personally, keep layers organised to know which is go on the top and which is go to the bottom was quite challenging for me. I thought that using elliptical tool to make interesting shape was very fun thing to learn.
Using magic tool, you can change the size of the tolerance. The lower the number, the more sensitive it is. The higher the number, the less sensitive it is.
Erika Fukasawa 