Begin a negative numeric argument for the next command
(negative-argument).
Part of the numeric argument for the next command
(digit-argument).
Move point to the beginning of the buffer; leave mark at
previous position (beginning-of-buffer).
Move point to the end of the buffer; leave mark at
previous position (end-of-buffer).
Display documentation of current major mode and minor
modes (describe-mode). The major mode
description comes first, followed by the minor modes, each on
a separate page.