This document provides an introduction to LaTeX, covering what LaTeX is, why you would want to use it, its document structure, and how to include math, R code/objects, and references. LaTeX is a programming language used to create consistently formatted documents across different document types. It allows for fancy fonts, automatic numbering, and embedding of other objects like figures, tables, and R code/outputs. The document structure in LaTeX includes the preamble, top matter, main text, appendices, bibliography, and comments.