I would show the shortcuts for the most common operations such as:
- Save: ctrl-x-s
- Save as: ctrl-x-w
- Open/find file: Ctrl-f
- Undo: ctrl-_
- Kill buffer: ctrl-x-k
- Switch to buffer: ctrl-b
- Fill paragraph: M-q
And copy/cut and paste:
- Set marker: ctrl-space
- Cut: ctrl-w
- Copy: M-w
- Cut line: ctrl-k
- Paste: ctrl-y
