The great coins that we invested for a long term maybe bitcoin or etherium. This two coins that ill know for a longterm investment, Because it is popular in a whole world. But they have some good coins also are better to invest for a long term and we can find them if need some research on it.
BTC is number one here. As for Ethereum, now, the situation is vague. However, I do believe that after the futures are approved, this altcoin will go up. I also trust it and like ETH.
Bitcoin is already known as the king of cryptocurrency and ethereum itself is an altcoin that is under bitcoin so the two coins need not be doubted and it is very good for long-term investment