LaTeX Document Structure

LaTeX has a document structure organized through document classes and supporting packages. These packages control many aspects of a document, including font size, page layout, table of contents, chapters, subsections, images, and text alignment. Because of that, choosing the right packages is important for improving the quality of your $\LaTeX$ document.

Basic Structure of LaTeX Documents

A $\LaTeX$ document has a basic structure marked by blocks enclosed by pairs of \begin and \end commands. A simple example is shown below:

\documentclass{article}

\begin{document}
Hello, world!
\end{document}

Each command in $\LaTeX$ begins with a backslash (\). In addition, every document should start with the command \documentclass{...} to define the type of document being processed.

Document Class Type

There are several document classes in $\LaTeX$, including the following.

General Document Classes

• article. The most common class for writing journal articles, academic papers, worksheets, and other documents without chapters.
• report. Used for longer documents that contain chapters, sections, and subsections.
• book. Used for writing books that consist of multiple chapters.

Special Document Classes

• letter. Used for official letters.
• beamer. Used for presentation documents.
• slides. Used for presentations with large sans serif text.

Package/Package

The part between \documentclass[...] {...} and \begin{document} is called the preamble. In this section, you can declare the packages needed for your document. For example:

\documentclass[12pt,a4paper]{article}
\usepackage[english]{babel}
\usepackage{geometry}
\usepackage{amsmath,amssymb}
\usepackage{graphicx}
\usepackage{xcolor}
\usepackage{background}

Information:

Packages for Layout and Language

• babel. Used to set language rules in documents.
• geometry. Used to define the layout of the document.

Package for Mathematics

• amsmath. Used for writing mathematics with more complete features.
• amsymb. Used for mathematical symbols.

Package for Multimedia and Display

• graphicx. Used to insert external images.
• xcolor. Used to apply color in documents.
• background. Used to add a document background.

Document Body and Examples

The part between \begin{document} and \end{document} is called the document body. In this section, you can write plain text as well as $\LaTeX$ commands. For practice, copy the following code into your $\LaTeX$ editor, either online or offline.

LaTeX Code Example

\documentclass[12pt,a4paper]{article}
\usepackage[english]{babel}
\usepackage{xcolor}

\begin{document}
\section{Sample Document}
This is a sample \LaTeX\ document.

\textcolor{blue}{This text is blue.}
\end{document}

Compilation Results

The compiled result will look like the following.

Closing

That concludes this overview of basic $\LaTeX$ document structure. I hope it provides a practical starting point for writing your own documents.