https://github.com/tidymodels/recipes
https://rviews.rstudio.com/2017/03/01/the-r-formula-method-the-bad-parts/ https://rviews.rstudio.com/2017/02/01/the-r-formula-method-the-good-parts/
Other slide decks https://github.com/ChuliangXiao/Tidymodeling http://josiahparry.com/post/2019-09-12-intro-tidymodels/
https://rviews.rstudio.com/2019/06/19/a-gentle-intro-to-tidymodels/ http://www.rebeccabarter.com/blog/2019-06-06_pre_processing/