The first rule is that we shouldn’t trust projects that promise us big gainings without risks. But actually, the thing is that scam projects don’t look furtive in most cases. Their task is to be as plausible as possible, so it is really difficult sometimes to find a trick. So the main thing is not to invest more than 10% of your capital in such projects and not to invest the whole sum in one project. You had better diversify.
Most of the the time, those project that gives hope with fast ROI and big gains in a short period of time are mostly scam. Never ever trust those projects otherwise you may end up losing a lot of money. And also regarding the percentage its fine even if you put half of your money as long as you know and you already research and well known creator are founder.