In the realm of self-paced interactive web lessons, I think DataCamp’s offerings are some of the best. Most content requires a paid subscription, but their Introduction to R course is free and gives a taste of the approach:
https://www.datacamp.com/courses/free-introduction-to-r
(All the R lessons: https://www.datacamp.com/courses/tech:r)
There’s a bunch of good stuff in this thread, too: