Even if we have this guide or percentage in trading, there is no certainty. I mean, the percentage you have given can be helpful, yes, but the thing is, the human mind has a different state. Even if they have this guide with trading, the human mind and decision can be affected. And in addition, you should also include management and patience in your list. Why? Because without proper money management, you will not know what will happen to your money, whether you risk it or not. You have to manage the money and capital you have to ensure profit or reduce losses. A trader without patience will be a disaster, as it will tend to affect every of his decisions with a slight means. That's why if a trader is involved in a trade, he or she should patiently wait for the result and don't be inpatient to exit the trade just because he or she sees that it's earning or losing.