Information Visualization is a collection of lectures and tutorials provided by Fachhochschule Potsdam. It is an open educational resource (OER) released in 2020, with content created for a summer course in "Information Visualization".
A short quote from the source page on the lectures and the tutorials:
The lectures cover the fundamentals of information visualization including some of its history, mapping data to visual variables, the role of visual perception and interactivity, techniques for visualizing various data structures, and evaluation methods.
The tutorials require basic familiarity with statistics and programming. They come as Jupyter notebooks containing both human-readable explanations as well as computable code.