Learning to trade is the most important thing, it doesn't have to be in class or have a mentor but just learn independently, especially now there is so much information that we can learn, the point is to learn. Because trading is not only difficult, but very very difficult. it takes years to learn technical analysis, risk and reward ratio, good money management, controlling emotions and greed.
I don’t agree that learning how to trade is extremely important. It’s an aspect to cryptocurrency investment and surely a way to build a portfolio but, it’s not the most important. You can do well in cryptocurrency even without having to trade I believe. Not so many in the field are traders and that’s mostly due to the high risk environment associated with trading live markets.
You could still be investing on the sidelines and be good, whatever goes for an individual I guess. In the end what’s most important is having to build your portfolio.