12.3 Table of Contents
The table of contents includes all headlines in the document. Its
depth is therefore the same as the headline levels in the file. If
you need to use a different depth, or turn it off entirely, set the
org-export-with-toc variable accordingly. You can achieve the same
on a per file basis, using the following 'toc' item in 'OPTIONS'
keyword:
#+OPTIONS: toc:2 (only include two levels in TOC)
#+OPTIONS: toc:nil (no default TOC at all)
Org normally inserts the table of contents directly before the first headline of the file.