Cryptocurrency Recommended Coins and Their Purposes. If you have no crypto assets yet, here are the coins I recommend for long-term holding, to make sure you end-up making profits in time! Bit Coin (BTC) Ethereum (ETH) THE PROBLEM WITH FIAT. WHY DO WE USE FIAT MONEY? WHY BITCOIN IS VALUABLE. Cardano (ADA) Polygon (MATIC) VeChain (VET)