For trading lessons one does not need to spend money to buy courses. Majority of youtube courses and all are shitcoin pumping schemes where shill make accounts to promote some specific coin and pump and dump it. While this can end up profitable for few people - those who join the market late are going to to lose initially and not something I would prefer because in the end it ruins your crypto trading experience.
I would suggest people to do research on altcoins and decide which coins to invest in. Then try trading on small capitals and watch which decisions were correct or wrong. Change decisions as per necessity and you will learn a lot of trading techniques.