"ctrl+C" copy.
Ctrl+J copies a layer.
Ctrl+shift+v paste. Press ctrl+shift+v to paste an area elsewhere, and the copied picture will appear in the center of the back area!
Encyclopedia of PHOTOSHOP common shortcut key commands:
1, CTRL+N or CTRL+ Double-click the PHOTOSHOP desktop to open the New dialog box and create a new file.
2.CTRL+O or double-click the PHOTOSHOP desktop to open the Open dialog box and open the image file.
3.CTRL+SHIFT+O opens the file browser window.
4.CTRL+ALT+O opens the "Open as" dialog box and specifies the format of the open file.
5.CTRL+W or CTRL+F4 closes the current image file.
6.CTRL+S saves the image file.
7.CTRL+SHIFT+S saves the image by "Save As".