First off, these are really old question and answers, which makes inertia important (It is not useful to pick through everything in our history for stuff that no longer fits with our current viewpoints).
Regardless, the first answer does have another answer than the links it posts:
The questions you're asking are answered in the hier(7) man page.
Read the manual is an answer, and in some cases it is the correct answer.
Secondly, not all link answers are inherently wrong, there are exceptions, doubly so with old posts.
From the post you yourself cited:
There's really only one valid exception to this rule, and that's when the question is:
Suggest me some tutorials where i can learn quick.
The question that has the answers you flagged:
Where can I find an explanation ... ?
I would put this in the same bucket as asking for tutorials.