Depth of Market, page-29

I am a huge fan of Claytrader. He does some great free videos that go through some basics that you need to get under your belt before he talks about a single chart. This guy was a former Maths whiz, and some of his videos should be essential viewing (can you tell I am a fan) and they are all framed around some simple Maths concepts that are set in stone.

https://www.youtube.com/user/ClayTraderVideos

Have a look and see what you think. He also offers courses etc and I am in no way recommending these to you. The reading/watching videos is the best way to go before you sign up for anything.