It's not enough Just to hear about ICO for invest and do not lose money. Learn the projects that are offered in the market  in the chosen field
I joined the German project Vreo.io  and before I dwell on this project, I analyzed whitepaper, market and existence competitors
Here is main criteria
1. Uniqueness, necessity of idea
2.Clear goal
3.Scalability
4.Transparency, properly allocated budget
5.Concept
6.Team
7.Distribution of tokens
Invest only if you are satisfied with all these points