Choose ICOs with a good idea (market demand, roadmap, profitability) from good people (reputation, experience).
There are also lots of good cryptocurrency blogs with well explained comparisons of recent ICOs, for example, here is a good recent one, all the guy' previous advice seems trustworthy: 5 Moon-shot ICOs set to shine in April and May 2018 - btw, his top 5 ICOs to invest in these two monts are: LCCX, Truegame, BitRewards, Minerva, XTRD.