In terms of learning resources for those who are just starting out, I'd also recommend this Microsoft Learn module which is free and takes less than hour to complete:
https://docs.microsoft.com/en-us/learn/modules/workplace-analytics-r-package/
The package website that @Carlos_Morales posted also has an Analyst Guide section which is a very good intro read:
https://microsoft.github.io/wpa/analyst_guide.html
For general R learning, my go-to recommendation resource is still the R for Data Science e-book written by Hadley Wickham (author of dplyr, ggplot2, and many popular household R packages) and Garrett Grolemund:
https://r4ds.had.co.nz/ (free online ebook)
