It is very important to check and learn about the coin before the investment. Also coin must have a good liquidity and big ecosystem. It must be simple to buy and sell coin. It is good that such platform like
https://www.koinal.io exists that allow to simple and quickly buy cryptocurrency directly from bank cards.
For me the most important thing the liquidity of the coin and the ecosystem it has. I agree that coin must have a develop ecosystem and to be in demand, that people would use it.