I know this is kind of an old tread but after years it still bothers me that individual lessons can’t be marked incomplete. I also like to peek ahead or sometime I start a lesson and get called away. In both circumstances the lesson gets marked complete. I would like to mark individual lessons incomplete. Another scenario is when I have completed the video but have not mastered the skill. I would like the option to mark these incomplete so that I can easily identify them to go back to without moving them to my favorites. I like to use favorites for things that I am confident in but still like to review fairly regularly or for things that I just enjoy playing.