It is necessary to begin with small, with a small amount, then gradually increase it. Choose a crypto currency and study it well. Follow all the news of the Crypt. Pay attention to Bitcoin's news, even if you did not buy it. Since Bitcoin affects all crypto-currencies. Continually study new information about crypto-currencies. Study, study and study again.
This is simple and good working strategy. The newbie must not make great investments. Sometimes $100 is enough to start with. You can deal with the cryptocurrencies that are under one dollar, and get several of them.