Loops are said to be nested when one loop is inside the other. Each inner loop is indented further. In the next program there are two levels of indentation.
//standard loop
repeat 4
//nested loop
repeat 8
forward 50
backward 50
right 45
//back to the standard loop
up
forward 100
right 90
down
Remember: comments are indented to the line up with the line that follows it
On your own #3:
Four Squares :
draw 4 squares using nested repeat loops—include 2 or more good comments.