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 (next-visible-heading ) moves down to the next heading line. C-c C-p (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.