Risk per trade?
If you look up on google - how much should I risk per trade - the general consensus is about 2% per trade. Because of the very high leverage offered in forex, few actually follow that rule.
The sneaky truth about why money management (risk management) has to do with randomness and the power of streaks. Randomness is more streaky than people tend to think, and the market is more random ( less predictable, more efficient) than novice traders assume it is. When a novice trader looks at the market, they do not tend to have a probabilistic outlook, rather they wish to be (and halfway expect to be) able to predict where the market will go on a very consistent basis.
My point is that even with a 50% win ratio ( coin flip ) there will be a losing streak of 5 approx. every 31 flips. If you are risking 5% per trade, that's a whopping ~23% of the account on a losing streak of just 5. So when you see people post about 5% or higher being a reasonable risk amount per trade, you can see why so many novice traders fail. Its not just the loss, but also the math in reverse. If a trader loses 23% of the account, they have to make ~30% to get back to break even!