B.21 For more information

The ggplot function reference is here https://ggplot2.tidyverse.org/reference/

You can see all the theme options here https://ggplot2.tidyverse.org/reference/theme.html.

The book R for Data Science is a great resource for tidyverse.

The tidyverse website has links to main pages for tidyverse packages (e.g. dplyr vignette and ggplot2 vignette).

Posit (formerly R Studio) has a collection of cheetsheets for these packages.

Many more examples are in the Gallery, and further explained through this book, especially in the early chapters.