CSS is a mighty powerful language for shaping your web objects. You will learn to create a two versions of a web button, one with and other without a transition.
You will learn how to manipulate a photograph in a way it will look like an object, melting snowman in my case, is sticking out of a photo using Photoshop CS5.
You don't need Photoshop or some other advanced piece of software to resize a large number of images at once. You can use Microsoft Office Picture Manager which is part of the Office suite.