资源：
- 画图 gallery https://www.r-graph-gallery.com/
- ggplot2 galley https://exts.ggplot2.tidyverse.org/gallery/
- https://github.com/jennybc/ggplot2-tutorial （本仓库链接）
- https://github.com/thomasp85/ggplot2_workshop （本仓库链接）
- https://github.com/erikgahner/awesome-ggplot2
- 人物
- Hadley https://github.com/hadley/
- Thomas https://github.com/thomasp85/
- Y 叔 https://github.com/GuangchuangYu/
- Zuguang Gu https://github.com/jokergoo
- Want more, see contributors of popular packages, e.g. https://github.com/tidyverse/ggplot2/graphs/contributors
研究个例子：https://www.r-bloggers.com/exploring-ggplot2-boxplots-defining-limits-and-adjusting-style/