Why are Sections Number 0.1, 0.2 Instead of 1,2,3
This problem occurs when you are using the report
documentstyle, and use sections as your top level of the
hierarchy. In the report style, it expects chapter; so,
everything is numbered as if it were in chapter 0, since you
don't have a chapter command anywhere.
There are two ways to fix this; either use the article style
(which has section as the top level in the hierarchy) or switch all
your \sections to \chapters, your
\subsections to \sections, and so
on.