ggplot2 (graphs)
If you’re after ggplot2 resources, Erik Gahner maintains a fantastic repository full of ggplot2 packages, extensions, tutorials, blogs, etc.
gt (tables)
For gt resources, I recommend reading through Thomas Mock’s two gt cookbooks: The basic one for beginners and his advanced version for deeper applications. Mock also maintains the gtExtras package for gt extensions and utilities.
A number of my visualization tutorials on this site also walk through gt applications. My cbbplotR package includes several gt utility functions as well.
rvest (web scraping)
As someone who came into R with no prior coding or front-facing experience, learning how to web scrape was challenging, but it shouldn’t have to be! I leaned heavily on these video tutorials by YouTube channel “Dataslice”. I also remember watching this longer tutorial produced by Duke University Libraries. (As a sidenote, I didn’t even know this existed, but it looks like a pretty decent “starter course” for R.)
The basic rvest vignette is another solid resource, as is its vignette about SelectorGadget (a must-have for web scraping, in my opinion).