In cryptocurrencies market, especially in investments in ICOs you should always invest only that amount of money, which you can afford to yourself to lose. Also always invest according to principals of diversification and money management. Also before investing you can try a deep study of information about the project. There are many materials how to do it. There is no any universal way for it, but first of all as it was motioned above you can learn ICO ratings, but you should know that these rating often ratings may be fake. That's why learn whitepaper of every ICO, try to understand what problem can solve technology or product is offered by the team. Also very important to learn information about team members, their experience and beta codes of the product, if it is possible of course. Don't believe to anybody, make your decisions based only on your own research on the ICO. But personally I like more just to trade, especially through marginal trading and get quick money.