What course can I take during my 4 month holiday to equip me with skills of trading and doing business online?

There is alot of business which goes on online. I have a 4 month holiday. I wonder if I can take a course that will equip me with skills to trade and do business online. Internet will soon become big business in my country after 2 undersea fiber optic cables are complete. I want to be competitive in all that business. What sort of course should I take for those 4 months?