[Ctrl+S]
[Ctrl+Shift+S]
[Ctrl+Shift+Z]
[Ctrl+A]
[Ctrl+E]
[Ctrl+C]
[Ctrl+Shift+C]
[Ctrl+X]
[Ctrl+V]
Save. If you take lots of steps, it is ease if Photoshop freezes.
Save As.
Step Forward. Unlike other some other software, [Ctrl+Z] can’t go back many steps. Be careful.
Select All.
Merge Layers.
Copy.
Copy Merged.
Cut.
Paste.