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8. Extended commands

M-x auto-fillAutomatically break long lines. If you are already in auto-fill mode, this command turns it off.
C-u n M-x goto-lineGo to line number n.
M-x spell-bufferCheck my spelling in this file.
M-x kill-rectangleKill a rectangle between point and mark, which should be at two opposite corners of the rectangle.
M-x yank-rectangleInsert the last-killed rectangle.
M-x tabify-regionConvert spaces to tabs in the region.
M-x untabify-regionConvert tabs to spaces in the region.
M-x undo or C-_Undo the last command.
M-x overwrite-modeChange to overwrite mode, so new characters replace existing ones. If you are already in overwrite mode, this command changes back to the normal insert mode, so that new characters are inserted before the character at point.