Reference......working with layers......

Other reference to learn how to working with layers can refer to :

tv.adobe.com/warch/learn/-photoshop-cs4/getting-started-05-working-layers/    

Through this video, we can learn working with layers step by step........

Tools panel overview.....

You can view information about any tool by positioning the pointer over it. The name of the tool appears in a tool tip below the pointer : 
        

                                           View full size graphic

Tutorial week 1 : Workspace......Tool Panel Overview

Before we start to use Adobe Photoshop, the first thing that we are going to do is understand all the tools. This can make things easy. When we start Photoshop, the Tools panel appear at the left of screen. Some tools in the Tools panel have options that appear in the context-sensitive options bar. These include the tools that let us use type, select, paint, draw, sample, edit, move,annotate, and view images. Other tools allow us to change foreground/background colors, go to Adobe Online, and work in different modes.we can expand some tools to show hidden tools beneath them. A small triangle at the lower right of the tool icon signals the presence of hidden tools.
We can view information about any tool by positioning the pointer over it. The name of the tool appears in a tool tip below the pointer. 

You can view information about any tool by positioning the pointer over it. The name of the tool appears in a tool tip below the pointer.

Now, I'm going to show all the tools and its function.





The Move tool and The Marquee tools :





The lasso tools and The Quick Selection tool : 







The Eyedropper tool and The Color Sampler tool :



The Ruler tool and The Note tool :



The Count tool and The slice tool :



The Slice Select tool and The Spot Healing Brush tool :



The Healing Brush tool and The Patch tool :





The Red Eye tool and The Brush tool :



The Pencil tool and The Color Replacement tool :



The Clone Stamp tool and The Pattern Stamp tool :



The History Brush tool and The Art History Brush tool :





The Eraser tool and The Background Eraser tool : 





The Magic Eraser tool and The Gradient tool :





The Paint Bucket tool and The Blur tool :



The Sharpen tool and The Smudge tool :



The Dodge tool and The Burn tool :



The Sponge tool and The pen tools :



The type tools and The type mask tools :



The path selection tools and The shape tools :





The Custom Shape tool and The Hand tool :





The Rotate View tool and The Zoom tool :



The 3D Rotate tool and The 3D Rotate tool :


The 3D Pan tool and The 3D Slide tool :



The 3D Scale tool and The 3D Orbit tool :


The 3D Roll View tool and The 3D Pan View tool : 


The 3D Walk View tool and The 3D Zoom tool :


Refer to this link :

http://www.tutorialboard.net/toolspanel/