If you are having trouble playing tabs, then I think, if I were you, I would just start at the beginning and go through the videos step by step. If it is something that you feel you already know well enough, then just hit the next button and go on to the next video. I have been playing quite a while, and I still go back to the basics to try and learn something that I might have missed out on. So, my advice anyway, would be to start at the very first course, and just keep working up from there. You will probably still learn some things, that you did not know before.