Press TAB on keyboard to indent a task on Taskade.
Sub-tasks are the children of a parent task. Each sub-task is also a task, so each sub-task can have sub-tasks, etc, infinitely.
Press SHIFT + TAB to outdent a task.
Fold / Unfold
This is where the magic begins. Unlike your word processor, which only knows about pages and paragraphs, the outliner knows which tasks are the subtasks of other tasks.
Fold (collapse) a task to hide its subtasks.
Unfold (expand) is the reverse operation of fold. If you want to quickly reference something in another section, you can expand it.