Many errant businessmen are selling trading courses. No one with a working formula will reveal their “magic formula” for a few thousand dollars. The efficient market hypothesis states that any formula that takes if released into public hands and if adopted by the public, will result in the nullification of the effects of the formula.
But the case is different if the formula is one based on simple probability. 50% of the time it works, 50% of the time it does not work. You sell the formula for thousands, show the cases when it works, find a reason when it does not. Offer advice on hindsight, give many caveats for future looking tips. This is an old business. People have sold gambling tips over centuries. Today, the same con men are legitimizing this trade by dealing with regulated instruments like stocks.
Let me unveil the business model. They get you in to attend a free course, hype you up, sell a 3 to 4 - day course for thousands. At the end of the course, they sell you more courses and formulas and unique programs. You get sucked into the program. Just when you think this is it, there’s more. You signed up with one of the brokers they brought. Every trade you make, they make a fee, or at least, they earned an introductory fee.
If you want to learn how to trade FX or stocks, read a proper textbook. There is no shortcut. Keep a few honest financial blogs. There’s not many.