Section headings of various sizes are produced (in the article document style) using the commands section,subsection and subsubsection commands. Latex will number the sections and subsections automatically. The title of the section should be surrounded by braces and placed immediately after the relevant command. To achieve this, latex offers us commands to generate section headings and number them automatically. Chapter headings are special, bot in output (displayed label) and in implementation (spacing, special macros for making the head). In contrast, sections, subsections and subsubsection are often done by startsection and can be treated similarly.