Select menu

As its name suggests, this menu contains everything to do with selections. Use its features to do the following:

• Select>All – A very handy command—select an entire image or the content of a selection, prior to you pasting it somewhere (Ctrl/Cmd + A).
• Select>Deselect - this effectively kills off the current selection (that is, turns 
it off—Ctrl/Cmd + D).
• Select>Reselect - used to bring the previous selection back into the image (Shift + Ctrl/Cmd + D).
• Select>Inverse - use this to flip your selection into a negative state. An excellent technique if your subject is hard to select but the background is 
not (Shift + Ctrl/Cmd + I).
• Select>Feather - this is an integral part of the selection process—to feather the edge means the sharp selection line is made softer.
• Select>Refine Edge - no selection is ever 100% perfect, so use this mini-utility to modify that selection edge.
...