In very basic terms, he teaches a simple strategy, and then coaches people to use it. His following is not massive - about 2,500 traders using it he says. At first I was very sceptical, because he seemed like an internet snakeoil salesman. But his honesty in being a sleezy internet salesman is refreshing. He will happily share how much money he makes from TFL (Trading For a Living) and how much from trading. He shares his losers as well.
Unlike stock markets, which can trace their roots back centuries, the forex market as we understand it today is a truly new market. Of course, in its most basic sense - that of people converting one currency to another for financial advantage - forex has been around since nations began minting currencies. But the modern forex markets are a modern invention. After the accord at Bretton Woods in 1971, more major currencies were allowed to float freely against one another. The values of individual currencies vary, which has given rise to the need for foreign exchange services and trading.
Never heard about Rob Booker. But if you interested in price action trading, Ichimoku trading & other PA based trading I would like to suggest Chris Capre for you. Because I completed few courses under him. Google 2ndskilesforex. Hopefully you can get to know more about him and there are loads of free articles, videos,analysis & other materials available there.