Albert Y. Kim;
Kelly N. Bodwin;
Alan T. Arnholt;
Alison Presmanes Hill;
Typo fixes and clarifying wording tweaks
With a big assist from @mariumtapal, we cleaned and refactored all R Markdown code to make it easier for future bookdown users to understand. However all code seen by readers of the print edition has been left intact.
Appendix C (online only):
Renamed from "Reach for the Stars" to "Tips and Tricks".
Added C.1 section on most common data wrangling questions we've encountered, mostly written by @smetzer180