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.