This is an unofficial reference manual for the LaTeX2e document preparation system, which is a macro package for the TeX typesetting program (see Overview of LaTeX).
This document’s home page is https://latexref.xyz; it has separate web pages for each topic. Alternatively. https://latexref.xyz/dev/latex2e.html has the entire document on a single page. For other output formats, the sources, and plenty more information, see https://latexref.xyz/dev/.
In this document, we will mostly just use ‘LaTeX’ rather than ‘LaTeX2e’, since the previous version of LaTeX (2.09) was frozen decades ago.
LaTeX is maintained by a group of volunteers (https://latex-project.org). The official documentation written by the LaTeX project is available from their web site. The present document is completely unofficial and has not been written or reviewed by the LaTeX maintainers. Do not send bug reports or anything else about this document to them. Instead, please send all comments to firstname.lastname@example.org.
This document is a reference, not a tutorial. There is a vast array of other information available about LaTeX, at all levels. Here are a few introductions.
Two pages of recommended references to LaTeX documentation.
Writing your first document, with a bit of both text and math.
A longer introduction to LaTeX, translated to many languages.
Introduction to the TeX system, including LaTeX, with further references.