Hi @Jadely98,
Under normal market conditions, most brokers including FOREX.com have monitoring systems in place that will automatically close your trade once your account falls below the minimum margin requirement. This is to reduce the chances that your account balance goes negative.
That said, you do risk incurring losses greater than your account balance, especially during periods of extreme market volatility. We discuss this in greater detail in the following post: Can I lose more than my deposit?
There is no real money at risk on your demo account, so we suggest placing some practice trades. Seeing how these trades impact your demo account balance can help you develop a better understanding of things.
Try looking at the same currency pair on 15-minute charts, hourly charts, daily charts and weekly charts. Each chart will show you a different perspective.
If you trade one micro lot (1,000 base currency units), then you are risking about 10 cents per pip. That means you could risk 500 pips on a longer term trade, and that would still be only $50. And again, this is all on a demo account right now, so no real money is at risk.
This is the time to experiment. Learn by doing. All the best!