My number one rule in trading and investing.

Start small and increase your position size when you are profitable.
You can ask: "what is small? What do you mean by small position?"
For beginners small positions is the smallest position which is possible to place a trade.
I hear you saying "it will take ages to trade for living this way" but remember this paradox
the easiest way to lose your money in trading is by trying to get rich quick.