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Training in such groups is usually a strategy to generate some credibility and in the end leave with full pockets, so it is best to inform yourself and learn on your own. That way we are more prepared.

can one learn everything on crypto on her own? I think training is important while one Carrie's out his own research. The training might not be in the group

It can be done, but it is not simple because it requires much more research. However, in groups of trust it is much better to learn.