A course in Phase 1 is under construction and cannot be accessed or tested yet.
Phase 2 ("Beta") starts when the course is completed and released publicly. At this time, the team starts to improve the content with the help of user feedback and thorough testing.
The course graduates to Phase 3 when all the kinks are ironed out. Even in Phase 3, however, we continue to optimize each course for the most effective and rewarding learning experience.