Anyone can loss why trading, adding to the fact that the market can not even be predicted so it is under probability, nobody really knows how the trading market works, especially if it is manipulated. Mistakes happens when we take some decisions we felt it is certain and will work just as expected but due to so unavoidable reasons it turns out the opposite, this situation can be seen as a mistake because it was not intentional, in a case where it was obvious that the trade will not favour a person at that point, but the person still insisted on giving it a try, any negative results from trying ones luck is a mistake because it is a deliberate attempt.
Yes everyone trading must first understand the how to read the chat which helps in deciding whether or not is good time to trade, because if the charts are not well understood. The is every possibility that one can be guessing before he or she can trade.
It is also important to decide buying a real Bitcoin or trade on deritives which means betting on the increase or decrease of the price of Bitcoin without having any coin.
Market speculation could also make one take wrong decisions while trading, confirming the address to which the coin are sent to if correct is important and avoid some fast interest offer, they might be a trap from scammers waiting to trap someone through captivating offers that could sounding like gold mine.