100 dollars is a safe AND SUFFICIENT amount to begin with.
That amount will help you gain technical experience on the platforms and help you learn how to manage the risks of trading.
Investing and trading are very risky activities. A great chance to make money but also a great chance to lose money. Therefore, here you need to have steel nerves.
Of course you need steel nerves and a cold head. Then you can earn in trading.
How much do you need to have a starting deposit to earn in trading? 100 bucks or is it generally a trifle to start a trade?