If you’d like to follow a webinar, try Plotting Anything with ggplot2 by Thomas Lin Pedersen.
If you’d like to take an online course, try Data Visualization in R With ggplot2 by Kara Woo.
R for Data Science is designed to give you a comprehensive introduction to the tidyverse, and these two chapters will get you up to speed with the essentials of ggplot2 as quickly as possible. The Data Visualisation and Graphics for communication chapters in R for Data Science. Currently, there are three good places to start: If you are new to ggplot2 you are better off starting with a systematic introduction, rather than trying to learn from reading individual documentation pages.