I would say also recommend to checkout positpbc youtube channel. It's run by posit company (earlier known as rstudio) and i think they have a playlist for tutorials. Also you can check out big book of R (just Google it) . It's a collection of all (almost) R related books.
Following is a personal opinion, so please read it with a grain of salt:
I generally don't go for paid courses because there are many free videos and lectures available. Rather, much better route would be to develop some package. Especially in R, you can create a ggplot templates package which is easy enough for beginners.