Before investing in the new project, whether it be - ICO or IEO is necessary will study a lot of information. First of all it is necessary to look at team, good team - the key to success. It is also necessary to study and estimate whitepaper. It contains a lot of useful information!
for IEO from big exchanger like Binance, Huobi and other big exchanger never make research before want to participate in their IEO because i'm 100% trusting this exhange and also the IEO