We use the main section of any document for the main title and introductory paragraph of the document.
And Sub Sections¶
This is a sub section. Note that the header for the section is underlined with dashes. The dashes need to extend equal to or further than the text above it for it to be a heading.
And Bad Bad, Sub Sub Sections¶
We want to avoid three levels of sections like this.
This is a better Sub Sub Section
In other words, just use bold for a third level section.