Most other front-matter is optional, but might include author information, abstracts, graphics, or other information that has more to do with describing a component than really constituting the component. But there must be still other countless errors of the same sort that no living man can yet detect, because of the fog within which our type of Western culture envelops us. But for a short component, you have the option of launching directly into block elements. Let us clarify what these things mean. As an example, in the above chapter, the epigraph is much like a short section.
Sections are bigger than blocks, and are in fact just a list of blocks.
How big they are is for authorial and editorial judgement. But there are two main strategies for making sections. I had a distinct sense of how important each type of section must be, and the numbering matched that well. However, for something like a technical reference, you are more likely to consider that your material might be nested in different places and different depths appropriately. There are some other specialized block types, but the above are the most general ones.