I think it is easy to teach kids about bitcoin, cryptocurrency or digital money. In this world right now, the kids encounter cashless payment as it is. I think in a few years time, cash will be archaic to kids and we will have a hard time explaining why we need cash.
Well we can teach a kids about bitcoin by showing them how bitcoin can be used, and how bitcoin is helping people to earn profit, we should tell the kids all the good advantages of having a bitcoin and we should tell the kids that the bitcoin is can be used in the future aside on paper money.