Book: R 4 data science (free)
Website: datacamp.com (paid, best money you'll spend)
R hands down is my favorite language, but here is some advice I would have wished to have early on. I wish I would have read Hadley's book above much earlier than I did; it is very insightful and useful. I was able to get off of SAS and delivering projects at work in less than 6 months with data camp. It's the fastest way you will learn R. You don't even need to know how to install R and Rstudio, although that is really simple.
Good luck, and welcome to R!
You should still expect challenges when using R on your machine as there is a learning curve with everything.