A frequent mistake of many traders is to start directly with an account with real money or start with the demo but move quickly to the real one without practicing enough. This will cause you to be unclear how and when to operate and end up losing your money much faster than you think.
Something you must understand from the beginning is that trading is not a game of chance. It is not about “guessing” by intuition in which direction the market is going to move but it requires training, experience, discipline and effort. With a demo account you will not invest your money from the first moment but you will have to invest your time and be patient.
The most important recommendation for you to learn how to invest correctly with a demo account is that you take the operations you perform as if you were operating in a real account with your own money. Try to forget that the balance of the demo account is virtual and that nothing happens if you lose it. If you would not like to lose your money in a real account then try not to lose it also in demo.