You don't even need to make an account or provide any of your personal information to start using the resources. It's a nonprofit organization with a mission to "provide a free, world‑class education for anyone, anywhere." So don't expect it to start charging.
You earn points as you progress and even get badges as rewards. This includes time spent watching videos, reading text, and scores on quizzes. All that data is then collated and can be viewed. The gamification side of learning uses quizzes, which are usually multiple choice. For example, there is a TED Ed-made video, one by UNESCO, and another made by The British Museum. Some very impressive specific videos made by great resources are available. This allows for both audio and visual input to support learning. Videos, many by creator Khan himself (who initially started this platform to tutor his nephew), are shot on a virtual background in which notes are written. A great feature that keeps everything feeling fresh and exciting. While courses are laid out in a way to teach before testing, using quizzes, it is possible to skip ahead if you've already covered an area.
While Khan Academy handles the teaching, the exam needs to be taken wherever its officially given for that school. Then, by taking an exam at the end, they can earn course credit that can be used in their college. These Advanced Placement courses allow high school students to complete a college course before they have paid for university. One very powerful feature of Khan Academy is its ability to offer AP courses for college credit.
(Image credit: Khan Academy) What are the best Khan Academy features?