Following are the quick keys in photoshop tools which can help you in designing....
'V' = Move tool
'M' = Marquee tool
'L' = Lasoo tool
'W' = Quick selection tool
'C' = Crop tool
'I' = Eye dropper tool
'J' = Healing brush tool
'B'= Brush tool
'S' = Clone stamp tool
'Y' = HIstory brush tool
'E' = Eraser tool
'G' = Gradient/ Paint bucket tool
'O' = Dodge tool
'P' = Pen tool
'T' = Type/Text tool
'A' = Path selection tool
'U' = Shape tool
'R' = Rotate view tool
'Z' = Zoom tool
Note: 'Some basic knowlege of tools in photoshop is necessary before going through the hot keys.'