R for Data Science (2nd Edition) – Free Online Book (Wickham, Çetinkaya-Rundel, Grolemund)
Read R for Data Science, 2nd Edition, free online. The complete O’Reilly guide to importing, tidying, transforming, and visualizing data with the tidyverse.
Data Visualization
Fundamentals of Data Visualization – Free Book (BSCS/BS Data Science)
Free official HTML edition of Claus O. Wilke’s Fundamentals of Data Visualization (O’Reilly, 2019): 30 chapters on choosing and designing honest, compelling figures.