1, note: write down your own understanding and experience of the original text below. For example, the well-known Shui Jing Zhu.
2. Book correction: understand the meaning of ancient books, and then supplement, correct, research and explain.
Exegetics is to explain (annotate) the words (words) of ancient books. There are many forms of annotation, one of which is "special book annotation"-that is, the annotation of an ancient book is specially written. In your questions, "preaching, writing, commenting, teaching, dispelling doubts, explaining, explaining, memorizing, communicating, learning, explaining, sorting, correcting, subtlety, hiding, writing, righteousness, justice, sound and meaning, chapters, definitions, supplementary notes" and so on ... so many names can actually be summed up in two categories. (B), in addition to understanding the text, but also to explain the "sparse" notes.
Annotation and sparseness are self-contained theories, and there are also "collective explanations" to collect opinions from various factions and "supplementary annotations" to supplement others' theories.