"Do not put the eggs in one basket".
If you compare to the cryto world, it means that don't put all your money in bitcoin or any other cryptocurrency. The explanation is simple, bitcoin or any cryptocurrency is not stable in price. And if you investing your money, the assurance to grow is not sure. And also your money will be hold until the value did not increase. And if this currency did not become successful, your money will gone because of wrong decision.