- toggle the fold of items
TAB
S-TAB
- move to next heading
C-u C-f
- move to previous heading
C-u C-p
- move item up
C-S-up
- rotate the state of TODO
C-c C-t
- change state of TODO
S-<right>
- start the clock
C-c C-x C-i
- stop the clock
C-c C-x C-o
- update the estimation, must before stop the clock
C-c C-x C-e
- cancel the clock
C-c C-x C-q
- insert a clock table
C-c C-x C-r