Mostly traders lose money because they want immediately money from each trade. Then greed comes, remove stop loss from trading and they lose all what they have.
They do not have short goal and long term goal. Under short term goal should be trading strategy and as long term goal is should be how to use strategy to have constant profit with small amount of loosing trades.
Master in trading usually have trading strategy where is stated which steps he must take before opening a trade. These steps prevents him doing wrong decisions and because his strategy is earlier tested it will give him profit.
While it is not so easily possible reach 100% master accept losing trade and mostly concentrate on having low amount of losing trades, as much is possible. All other trades that are not losing ones means that they are profitable trades.