Good altcoins have long been known and proven, which for years on the market and traded on many exchanges. Of course it is ETH, LTC. I also have a good Monero, Steller, ETC, NEM. That's my personal opinion. You have to study each of them and already have to make the decisions yourself. I also believe that Dogecoin will make a good profit. It's also an old, proven and very popular coin. The principle when the altcoins season comes then on all coins there will be a good pump