If you have know nothing about crypto currency and its risky, then buy bitcoin and ethereum because they have good perform for long term invest. 
Correct if you dint have enough knowledge and you didnt want to explore the industry then better to stick with btc and Eth as they canbring more value, just invest what you can afford to forget, but if you are keen to learn I think Waves and stratis can be a good option
too better to read more about those projects.