Latex有三种标准文类：book, report, article. 每种文类的章节命令和层次深度如下：
| 层次深度 | 层次名 | book | report | article |
| -1 | part | \part | \part | |
| 0 | chapter | \chapter | \chapter | \part |
| 1 | section | \section | \section | \section |
| 2 | subsection | \subsection | \subsection | \subsection |
| 3 | subsubsection | \subsubsection | \subsubsection | \subsubsection |
| 4 | paragraph | \paragraph | \paragraph | \paragraph |
| 5 | subparagraph | \subparagraph | \subparagraph | \subparagraph |
本文摘自《latex 完全学习手册》（第二版，胡伟编著）