Here are 2 assignments for you

Create 5 circles having the following dimensions
1st circle – red color – 350 * 350 pixels.
2nd circle – grey color – 300 * 300 pixels.
3rd circle – red color – 250 * 250 pixels.
4th circle – grey color – 200 * 200 pixels.
5th circle – red color – 150 * 150 pixels.

Arrange them randomly and select all
Using Align and Distribute, change Relative to option to Biggest selected.
Click on Align left edges.
Click on Centre on horizontal axis.
Create 6 squares of blue color and size 100 * 100 pixels.
Select all squares and open Rows and columns.
Arrange them in 3 rows and 3 columns.
Set both vertical and horizontal space parameter to 20.