This is available online as an eBook or you can order it from amazon. Kieran Healy distills tons of valuable information on working in R, RStudio, and the benefits of working in plain text (see his other book dedicated to this topic here).
This package is not necessarily new, but I feel it needs more attention than it’s been getting. The janitor package “has simple functions for examining and cleaning dirty data. It was built with beginning and intermediate R users in mind and is optimized for user-friendliness.” The clean_names() function is a life-saver.
Do you do everything inside RStudio? I try to, and now I can use Python without ever leaving the comfort of my IDE thanks to the reticulate package. Check out the tutorial on RStudio here.
If you ever have the pleasure of using regular expressions, check out regexplain, an excellent RStudio Add-In.