The altcoin that I think they have good potential and worth to invest it is Ethereum, Cardano, NEO and Monero. Ethereum is widely loved, it is widely used in ICO projects. Every day Ethereum has a huge trading volume indicating that this is altcoin has very good potential. Cardano has a professional development team, Cardano's growth rate is very stable, and in the next few years I believe it will become one of the strongest altcoin. NEO, NEO is called Ethereum of China, NEO's support community is huge, and it also has better transaction processing speed than Ethereum. Finally, Monero. The most prominent feature of Monero is its privacy. When the crypto market is controlled by the government, Monero will be more popular and of higher value