1) Due diligence
2) Research deeply and don't stop at your first results
3) Try to find informations on trusted websites and cryptocurrencies sources
4) Never invest what you cannot afford to lose
5) Stay safe and stick to basic internet security rules

Here it is a good list of active ICOs, however it's up to you to research about the genuinity of each of them: http://www.coincaps.ai/en/crypto-ico/active