I think there is no quick way to learn trading. Trading is not only about theory, but about how to analyze and decide what to do. All things need a process and are not instant. You may find free courses on well-known exchanges such as Binance. They have an introduction to learn about what cryptocurrency is and how to do trade. But that is not enough because it is very limited. You have to increase your insight with other reading about how to carry out analysis and gain profits. You should also try it with your own hands. Of course you will lose some on your walk, but that's how you learn to trade.
There are ways to learn trading and that way is considered the best way, taking time to learn and practicing without being so greedy that's one of the best ways to be a quick learner in trading.In learning how to trade you will need to understand very well the basic format you should emphasize on when trading, learn when to go in and understand when you should go out. If you are able to understand and take greed out of your head, you make be getting a small profit that will expand within a short time but greed has made most traders lose so much that they now think trading is gambling.