I started Swift 2.0 Basics & even though I haven't finished the course, I want to completely start over, how do I do so?

The way treehouse is designed is so that you can watch any video anytime even after you have watched them. There is currently nothing you can do to delete the progress you have already done and hit a "restart" button. But you can start the course all over again with out a problem that includes doing the quizzes and challeges. All you have to do is click on the track you are working on and go to the very first video of the course and as you watch it and click next it will follow to the next video as if you had not yet watched it. All the quizzes can be done just as you had done before no answers will be displayed. In some videos you may see two options one to restart the video from the beginning or watch where I left off. Just click restart video. Just to point this out You will not receive any extra points for redoing the video or quizzes. Good luck