To become a good trader, one must be ready to learn how things work when it comes to cryptocurrency trading because it goes beyond the mere principle of buying at certain low price and selling at certain high price to make profit. The trader must first know which exchange platform to choose for trading, which altcoins are favourable for trading at a particular point in time, how to access and analyze market trends and data, how to read market graphs etc.
The key is study study study. That's the only way to be good at trading. When I started out newly, I had to familiarise myself with technical analysis and I found materials from babypips very helpful. Also experience and patience matters alot. Even when you make mistakes, always keep your cool and learn from every incident and remain consistent