How do I remove the numbers from section headings?

If you'd prefer your sections, subsection, and so forth to be displayed without numbers on the left side of the title, you simply add a * symbol to the command. (Note that section headings created this way will not be listed in the table of contents \tableofcontents.)

For example, you can get a section without a number using the following command:

\section*{Your section title}

For more information, and to see how to display specific numbers next to section headings, see the LaTeX Wikibook.