To Do indicates that a task has yet to be done. Or, to take it a little further, has yet to even be started.
The In Progress task status is there for tasks that you’ve begun working on but have yet completed. Perfect for tasks that take multiple days to complete.
The Waiting status indicates that it can’t progress because you’re waiting on someone or something.
Done means done. When you’ve completed a task, mark it as done. It’s a satisfying feeling.