Jiu-Jitsu is a live interactive art.  You can watch a video and watch it and try on your own to mimic that movement, but you are never going to get it right.  Yo thoroughly understand the movement and learn it you have to be able to interact live with an instructor.  No where in the world will you find anyone successful who has gotten there entire education online.  It disgusts me that you can get a certification online by getting promoted in their belt ranks through online examinations.  The reason that disgusts me is because there is no physical verification that you do that in a live situation.  Just because you can recite a movement on the ground is no different than if you did it in the mirror. They are promoting people that they don’t know their character, I would never put my name behind someone that I don’t know their character.