Any headline becomes a TODO item when it starts with the word ‘TODO’, for example:
*** TODO Write letter to Sam Fortune
The most important commands to work with TODO entries are:
,-> (unmarked) -> TODO -> DONE --.
'--------------------------------'
The same rotation can also be done “remotely” from the timeline and agenda buffers with the t command key (see Agenda commands).
shift-selection-mode. See also the variable
org-treat-S-cursor-todo-selection-as-state-change.
KWD1|KWD2|... to list
entries that match any one of these keywords. With numeric prefix argument
N, show the tree for the Nth keyword in the variable
org-todo-keywords. With two prefix arguments, find all TODO states,
both un-done and done.
agenda-mode, which provides commands to examine and
manipulate the TODO entries from the new buffer (see Agenda commands).
See Global TODO list, for more information.
Changing a TODO state can also trigger tag changes. See the docstring of the
option org-todo-state-tags-triggers for details.