Outline mode provides special motion commands that move backward and forward to heading lines.
outline-next-visible-heading).
outline-previous-visible-heading).
outline-forward-same-level).
outline-backward-same-level).
outline-up-heading).
  C-c C-n (outline-next-visible-heading) moves down to the next
heading line.  C-c C-p (outline-previous-visible-heading) moves
similarly backward.  Both accept numeric arguments as repeat counts.  The
names emphasize that invisible headings are skipped, but this is not really
a special feature.  All editing commands that look for lines ignore the
invisible lines automatically.
  More powerful motion commands understand the level structure of headings.
C-c C-f (outline-forward-same-level) and
C-c C-b (outline-backward-same-level) move from one
heading line to another visible heading at the same depth in
the outline.  C-c C-u (outline-up-heading) moves
backward to another heading that is less deeply nested.
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