Risk management is what helps you trade sustainably. A few essentials:
Decide in advance how much you're willing to risk per trade, per day, and per week — and trade small while you're learning.
Use a Stop Loss (SL) to close a losing trade automatically at a level you choose, and a Take Profit (TP) to lock in gains when your target is hit.
Don't over-leverage — higher leverage means larger swings in both directions.
Keep an eye on your margin level. If it falls too far you'll receive a Margin Call, and the platform may force-close positions (a Stop Out) to limit further losses.
Remember swaps — holding positions overnight can add a cost (or sometimes a credit).
See more on protecting your account in Trading basics.
CFDs carry a high risk of losing money rapidly due to leverage. Never trade with money you cannot afford to lose.