SiteData Visualization & Charts · Chart design resources
Interactive decision tree mapping data shapes to appropriate chart types, with caveats and code in R, Python, D3 and React.
Why it’s a gem
Includes a caveats gallery of common mistakes, which most guides skip
Catalogue of 200+ chart and diagram types filterable by function, input data shape and visual form.
Financial Times poster and source files classifying chart types by the relationship they express, plus Chart Doctor examples.
Open-access book on the theory and craft of scientific figures, with full source for every figure.
Free documentation-plus-theory site covering chart choice, colour, annotation and map design from the Datawrapper team.