Blog hierarchy and rationale

[NumNum]

Is it written somewhere that explains the Blog system and hierarchy?

I want users to only be able to post into one of the several Blog categories. So I don't want them to be able to "create a new blog".

I have a few other questions but want to reference any guides that explain things.

Understanding the hierarchy would help me understand this filing system this uses. 

Found this to review;

Edited April 1, 2021 by NumNum