Without knowing your background, I would start following Matt Dancho on linkedin. There's a number of routes you can take. I would opt with the Udemy first to get your feet wet. It's a cheaper route.
https://www.udemy.com/course/r-programming/
There's a number of financial risk courses with R. Here's just one. Generally anything above a 4.5 rating in udemy or coursera is half decent.
https://www.coursera.org/learn/financial-risk-management-with-r