Edit menu

This is an important menu because it gives you multiple undo/redo commands. In fact, Photoshop Elements allows you to go backward as much as required. Also, try using the Ctrl/Cmd + Z (undo) and Ctrl/Cmd + Y (redo) keyboard shortcuts.

Also use this menu to copy and paste data into an image or to do any of the following:

• Edit>Revert - Return the file to its pre-edited state (Shift + Ctrl/Cmd + A).
• Edit>Copy - Copies the content of a selection (Ctrl/Cmd + C).
• Edit>Copy Merged - this copies the contents of a selection plus any layers 
in the document by merging them, 
then copying the result (Shift + Ctrl/Cmd + C).
• Edit>Cut - deletes the content of a selection (Ctrl/Cmd + X)—although it can be pasted back into the same document, or a different document, if needed, but only before further saving.
• Edit>Paste - Pastes the (copied) content of a selection (Ctrl/Cmd + V).
• Edit>Paste Into Selection...