Losing in money is normal in trading because what we are doing here is we are trying to outsmart each other and trade against the market which is very volatile to deal with. If you are a trader, you have to equip yourself with the right knowledge so you can be more profitable and of course expect losses along the way. What we can do is to minimize the number of our losses and have a good and realistic target profit.
It is true that knowledge is very important for us to analyze the market to get what we expect, but sometimes many novice traders do not use indicators available on the exchange such as SL or TP. In my opinion, this method is quite good if we use it to minimize quite large losses in this case, and it's best not to be too greedy if we get profits from trading, even though they are small, but if we do it regularly the results will certainly be big too.
Correct that balance between contentment and greediness is what we need to handle, even how small the profits if we continually doing it we might grow our balance positively, unlike with greediness where we keep aiming to earn big the backfall is instead of taking profits it will bounce back and let us lose our money.
There are people who use their knowledge to anticipate using patterns and indicators but they are mostly focus on how they control their own emotions while positioning their trades, it's very important to avoid losing a lot.