Investing in cryptocurrency needs a lot of research and you need to be active on the project that you choose to invest. Of course, to update yourself on how this project progress each day.
For me, Ethereum, Monero, DeepOnion, and NEO is my top options on altcoins that will grow this 2018. Especially the DeepOnion project, lots of features to be added soon, and they already upgraded its anonymity to its finest.