You tube is a perfect place to see videos whatever whichever you want.As google is full of information similarly you tube has all videos whichever you want either it be entertaining or study purpose.
I feel it is very best way to study things as things are much easier to learn by seeing rather than by trying to grasp it. The video is of high quality so makes it more better.
uploading and sharing videos can help people to earn money also so is a great way to earn sitting at home.