Technically, knowledge such as technical indicators, order types and the use of stop loss or stop limit orders must be understood and can be applied.
And for the fundamentals, it will have to do with the psychology of the market or the psychology of a person who is trading.

Psychology will determine the final outcome because the decision will depend on the trader.
But if the technical is done correctly and the predictions are in line with expectations, then psychology will also be more helpful.

Everyone will never be free from the psychology of trading, and that will be one of the factors that influence profit and loss on trading.
It's just about how everyone manages psychology or emotions on the trades made.