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.