I cannot imagine what we need to learn to become a professional trader because we have different methods for learning to trade and we have different experiences in trading. but I think we can learn many tutorials by watching a video, reading some books in online or offline, practicing what we learn, try to analyze the market and we can try to get more experiences by doing trading.
I think what makes you a professional trader is from your experience. the more experience you have, the more professional you will be. of course to get that experience you need to keep trying not just learning, what you learn must be applied and practiced, then over time you will become an expert..
besides of our experience, we need to learn many things to become a professional trader and the learning will never stop because we need to always learn every day. and yes, the experience is the most important lesson that we can get because with the experience, we can get live lesson form the trading itself so it will increase our skills in analyzing the coins.