Move point to the beginning of the buffer.
With numeric arg N, put point N/10 of the way from the beginning.
If the buffer is narrowed, this command uses the beginning of the
accessible part of the buffer.
If Transient Mark mode is disabled, leave mark at previous
position, unless a C-u prefix is supplied.
Don't use this command in Lisp programs!
(goto-char (point-min)) is faster.