You have to investigate the ICO properly. Like checking out their members history, Analyze their project if it has potential or not. And must thing to do is read their whitepaper. A good ICO should be very clear in every aspects, their presentation should be top notch. I know that it will take time to do all this. There is another way you can always select top charts altcoins to invest. Just see coinmarketcap. I think all the top 100 is real.