You may find your planner pages getting very full, so that you want to have one broad task entry be linked to a more specific list of sub-tasks. Or, maybe you want to have a number of notes linked to a particular task. This can be done with targets. You can have a task that is really a meta-task:
#A1 _ Do things in RevelleLog#13 {{Tasks:101}} (RevelleLog)
‘RevelleLog#13’ could then be a list of sub-tasks in the form of a note, or any kind of note.
Or, instead of pointing to a particular note on ‘RevelleLog’, you could have the whole page be tasks that you enter in manually, without linking them to another page. You can just type them in like this:
#A1 _ First specific thing to do
This way, the tasks will only appear on this specific project page, and not on any daily page, so you only see them when you want to look up all of the specific tasks associated with ‘#A1 _ Do things in RevelleLog {{Tasks:101}} (RevelleLog)’.
As you can see, the ability to manually enter tasks is one of Planner's nicest features. It allows you to create tasks that are not assigned to a specific date (by manually entering them on a project page with no date) or to a specific project (by manually entering them on a day page with no project). Yet as long as you enter them using the syntax it understands, Planner will continue to recognize them as tasks.
Another way to have a task not be connected to a particular date is to
do C-c C-c (planner-copy-or-move-task) and specify
‘nil’ when asked for the date.
If you would like to see a list of all of your unfinished scheduled tasks, do M-x planner-list-unfinished-tasks. It is only intended to give you an overview. Any editing you want to do, like marking tasks complete or editing their description, still needs to be done on one of the tasks' “real” planner pages.