There are no exact rules to follow,but there are a few things you can do to reduce the probability of being scammed. Check if there is a prototype or an actual product. Insist on seeing some code ala github. Things like this really helps.
Good information, also keep in mind that if there is a big difference between the hard and soft cap, it is probably a scam.
do not invest ICO will 100% avoid scam.
as true as this sounds, no risk, no gain. There are genuine ICO's out there, filter them and you will profit.
any project has a chance to failure
True. even if a project is not scamming, It could still fail. success is not guaranteed.