The most important advice for newbie trader is don't be Greedy.
You should take into account all the possible risks and don't allow yourself to trade with such amount of money that you can't afford to lose.
As i read on Monfex "To start with, you should first set some conditions for your trades, based on your trading style. These conditions should inform when you go long or go short, when you enter or exit positions and what technical indicators inform your decisions. The more specific your conditions are, the easier it will be to not only follow through and implement your trading plan, but also to gauge and evaluate its effectiveness moving forward."