How to make money with exchange rates

Can this people really help? Fluctuation of 10-20% of the currencies can really make fortune if you buy foreign currency cheap. Here is an article (http://www.currencies.co.uk/press/market-report-detail.aspx?ContentID=1363) from Foreign Currency Direct: "if you want to increase your business profits through better exchange rates take a look at our Forex for Business pages, and our best exchange rates."