What cryptocurrencies to buy in 2018 to earn

1 CARDANO
CARDANO is a decentralized cryptocurrency whose aim is to provide more advanced functions than any previously developed protocol. CARDANO is a 3-generation cryptovwack, which means that its blockchain has been written from scratch and is being developed by a group of specialists from around the world.
In December, it recorded a large increase in value, picking up a large drop in value at the beginning of January.

2 IOTA
IOTA the first decentralized cryptocurrency without blockchain.
Like Cardano, in December it gained value, losing in January.

in my opinion, both cryptocurrencies may gain in value in 2018
although I do not think it will happen soon