Introduction to Graphic Design
Deadly sins of Graphic Design
Straightening an Image
Correcting Perspective with Crop tool
Using the Marguee and Lasso tools
Using Improved Selecting and Masking
Content Aware Filling and Healing
Refining Selection Edges
You should be concentrating on working through your DVD tutorials up to sections 6 and 7 at this point.
Making Selections in Photoshop
Making Selections (again)
Making Selections with the Pen Tool