This kind of information is not eligible for every trader in my opinion, the understanding level is not same for everyone as we know. IEOs can be better than ICOs in terms of return on the investment but it overqualified by everyone for the same reason.
IEO does not need to learn much before investing, just choose big exchange to invest in projects that sell tokens on it. It's simple, but the current situation of overcrowding is also the part that many people cannot afford to buy