Here is a selection of my Data Science and Programming skills and tools that turned out to be helpful in my work and I believe are important for any Data Scientist as well. The last update of this post was done: 2018-05-23. Data Science Skills Data Manipulation
Efficient data manipulation in R; dplyr, data.table, reshape2. Working with dates and time-series; lubridate, xts.
RStudio IDE, Markdown, LaTeX;
Version: 1.2 The last update of this post: 2018-05-23. Below is a checklist that I wrote for my own purposes. I helps me to be sure that I did what I should have done before release a new version of R package to CRAN. Maybe it will also help others. See what new Hadley recommends: (http://r-pkgs.had.co.nz/release.html). Update R & packages: R all packages RStudio (stable or preview version).
Update your package: Check unit tests.