| Operation | Command | 
| General | |
| Quit Emacs | Ctrl-x Ctrl-c | 
| Cancel an operation | Ctrl-g | 
| Undo | Ctrl-Shift-dash (-) | 
| Menu (from putty) | F10 | 
| File | |
| Open | Ctrl-x Ctrl-f | 
| Save | Ctrl-x Ctrl-s | 
| Close (kill a buffer) | Ctrl-x k | 
| Switch to file (buffer) | Ctrl-x b | 
| Edit | |
| Select | Ctrl-space | 
| Copy | Alt-w | 
| Cut | Ctrl-w | 
| Paste | Ctrl-y | 
| Indent | tab | 
| Go to line | Alt-g g | 
| Find (and again) | Ctrl-s | 
| Replace | Alt-Shift-% | 
This is only a short list of the most common key bindings that would be good to remember. A more complete reference can be found at http://www.emacswiki.org/emacs/Reference_Sheet_by_Aaron_Hawley