Tap the menu button and select "New List". When creating a list both a parent list and sub list will be created automatically.
Tap the + button. Give your new task a title, notes, reminder, priority etc. Tap the save button
Alternatively you can use quick add (bottom of your screen) if you don't need any of the extra task details.
Use the drag handles to move tasks vertically. Tap, hold and drag to move.
Swipe a task left/right to delete it. If you find this feature unnecessary you can disable it in settings.
Sub task lists allow another layer of structure. They are displayed as tabs. To get started tap the add sub task list button and give it a name.
Open the main menu (top left) and select settings. You will find many options to customise Tasks to meet your needs.
Filtered list are exactly that, a filtered view of your tasks. It does not duplicate tasks so any changes will be made to the original task. An example would be: all non-completed tasks with high priority that are due in the next 7 days.
View your tasks in a calendar. The calendar view can be enabled from Tasks app settings.
"Any sufficiently advanced technology is indistinguishable from magic." - Arthur C Clarke