I'm happy to with the very specialized areas of company trading and faction trading
You'll need quite a bit of initial capital (at least 150m for company trading, and 500m for faction trading) if you want to get into either or both of these fields, but they can provide immense profits if done right
Note: preferably you choose faction trading, as if you don't have business educations, you run the risk of having your company drop stars, which equals you lose a ton of money
Requirements other than tons of cash: TONS of patience