On Assignment

Effects of Aperture on Depth of Field

Practice using aperture by completing the Effects of Aperture on Depth of Field assignment found here

Hyperfocal Distance Photo Assignment

See the Effects of hyperfocal distance by completing the Hyperfocal Distance Photo Assignment here. 

Links for the Curious

Click here for a click reference material on Aperture

Nikon Learn & Explore: Bokeh for Beginners

Understanding Aperture:  Controlling Light Based on the Exposure Triangle

f/8 and Be There

Hyperfocal Distance & Depth of Field Calculator at Photopills.com