There are demo and cent accounts for training and they should be used, but they will never replace the adrenaline rush of a real dollar account. Let’s face it: when you risk nothing or risk losing 10 cents, your strategies and tactical decisions will not be the same as if there is at least $10, $100, or $1000 at risk. Your mental focus is simply not the same.
And if someone, such as a broker, donates $10 to you to try your luck or strategy in the market, you should embrace the opportunity to try a real trading situation, or to test how well you understand the market mechanisms, or to decide whether you even like Forex trading or not.