That is all true. One of the advantage of knowing trading or knowing how to trade is you know how control your money or coins to avoid big losses and of course to earn. There are lot of people who have tried trading but due to having not enough knowledge, they lose and sometimes leave trading. Trading may seem to be as simple as buy low sell high, but when you are at the point to look at the market you'll be asking yourself is the market low or high?
What was the coin that you tried to trade and how long did you trade the coin? Some coins are good for long term hold. Some coin are good for scalping.