There are many sources from which you can learn trading like YouTube and Udemy. There are also many paid stock market courses and most of the rules of stock market also apply in crypto market also. And i don't support it but you can also download the courses for free if you don't want to pay all you have to do is search the internet and invest some time in finding them, but I'm sure you can find a few free courses. But according to me watching many hours of YouTube videos and reading many books will give you a basic idea about trading and then you can start trading after practicing in trial accounts.