This online book is a work in progress.
R for Beginners (Link)
The R Workshop Book (Link)
R for Data Science, 2nd Edition (Link)
Modern Statistics for Modern Biology (Link)
A Practical Introduction to Python Programming (Link)
Automate the Boring Stuff with Python (Link)
Data Science Specialization (Coursera)
Introduction to R (DataCamp)
Ten simple rules for biologists learning to program (Link)
Ten simple rules for getting started with command-line bioinformatics (Link)