Edward Tufte is infamous in the Data Visualization world, and considered the Single Source of Truth on how to visually present information.
Tufte has written multiple books, so it's hard to know which to pick up. In his own descriptions:
Tufte sets out to teach us a series of design strategies - "the proper arrangement in space and time of images, words, and numbers - for presenting information about motion, process, mechanism, cause and effect"(9)
Good visual explanations show the qualities and functions of concepts, relationships between concepts, and events that occur around them
At the core of Visual Explanation is showing relationships between concepts, and events that happen between them. I personally like to simplify these to nouns and verbs. This includes what causes those events, and what effects those events have.
Opens with a beautiful quote from Emile Durkheim from The Elementary Forms of Religious Life:
"Categories such as time, space, cause, and number represent the most general relations which exist between things; surpassing all our other ideas in extension, they dominate all the details of our intellectual life. If humankind did not agree upon these essential ideas at every moment, if they did not have the same conception of time, space, cause, and number, all contact between their minds would be impossible..."
Visual explanation is not new. Tufte points to a number of good examples that all "demonstrate methods to represent, describe, illustrated, and indeed, construct knowledge"
In 1633 Robert Burton published The Anatomy of Melancholy - A heavily illustrated medical textbook about melancholy
Similarly, in Thomas Hobbes's Leviathan hammered down on his political opinions and insist on his pessimistically dire account of human nature as "nasty, brutish, and short"
Richard Feynman's space-time diagrams of quantum electrodynamics
"Clarity and excellence in thinking is very much like clarity and excellence in the display of data" ... "The act of arranging information becomes an act of insight"
These Design Strategies arrange images as a narrative in a way that is more "lyrical" than quantitative. We want to make designs that "enhance the richness, complexity, resolution, dimensionality, and clarity of the content"
"By extending the visual capacities of paper, video, and computer screen, we are able to extend the visual capacities of paper" (10)
These focus on parallelsims, multiples, and confections