Latex Grammar Summary-Hierarchical structure

Hierarchical Structure ~ ~
Documentclass[a4paper,11pt]{article}
\usepackage{cjkutf8}
\usepackage[top=1in, bottom=1in, left=1.25in, right=1.25in]{geometry}
\title{rookie also learn \latex}
\author{Secrecy}
\DATE{2009-8-8}
\begin{document}
\BEGIN{CJK}{UTF8}{GBSN}
\maketitle
How to use \latex
\section{latex How to use section}
Text below the section
How to use \subsection{latex subsection}
Subsection the following text
How to use \subsubsection{latex subsubsection}
Subsubsection the following text
How to use \paragraph{\latex paragraph}
Paragraph the following text
How to use \subparagraph{\latex subparagraph}
Subparagraph the following text
How to use \subparagraph{\latex subparagraph}
Subparagraph the following text
How to use \subparagraph{\latex subparagraph}
Subparagraph the following text
\END{CJK}
\end{document}
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Enter the color problem for MATLAB code: http://www.latex-community.org/viewtopic.php?f=19&t=3135
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The double quotation mark problem. Left quotation mark with 1 front key, ..., closing quote with quotation mark Key.

from:https://www.douban.com/note/250092176/

Latex Grammar Summary-Hierarchy