The thing that I often heard when I was at school is don't put something valuable in one place, if the place is damaged then we will lose everything, and the important thing we have to do when investing is always share it in many places, cryptocurrencies are very promising investments but have a high risk so we have to share it with other types of investment such as stocks, property or others.
That is also what I've heard in school coming from my teacher. For example, if you save some paper money (except coins) in your piggy bank, if something happens like a flood or your house gets burned, your money will also be gone, and they explain that we should put it in the bank or create a business that you can invest in because holding or hiding that money means that it won't grow, but the value is the same.