If you’re asking about “real money” meaning actual profit and not paper trading, then one can make real money with a $100 account.

But if by “real money” you mean large profits, as in “where’s the real money at?” then you need to invest in a larger account.

It’s important to remember that the amount of money you can make depends on the size of your trades and the size of your trades depends on the size of your account.

For example, a trade of 5 lots can make you a significant profit off just that one trade (assuming you got the direction right - it can also turn against you), but you cannot place trades of 5 lots with a $100 account. So again, large profits = large trades = large account.