It seems to me that bitcoin is the best currency to earn on the course. The price is not very stable and fluctuates constantly in different directions. It is possible to earn and gain experience for the transition to earnings in other currencies.
Yes, you can learn how to earn money on bitcoin. But it is suitable for short-term investments, because it is very unstable and no one can tell exactly what will happen to it in a few years.
to make money with money, then trading is suitable for it, probably very much like that, but among all the trading is able to provide a great advantage, with less risk. so, try to trade if you want to make money with money.