Nothing is hidden. It is just written in a language nobody taught you.
What you get
A glossary of the language that shows up in account statements, prospectuses and disclosures, with each term written out in plain English.
It defines terms. It does not tell you what to buy, what to sell, or what to do with your money, and it never will.
Written by someone who reads these documents for a living, and got tired of explaining the same twelve words.