From command mode, the x command deletes the character under the
cursor. If you press 
five times, you'll end up with:
Now press 
, insert some text, followed by 
:
You can delete entire lines using the command dd (that is,
press 
twice in a row). If your cursor is on the second line,
and you type dd,
To delete the word which the cursor is on, use the dw command. Place the cursor on the word ``good'', and type dw.
