Coursera is an online platform for learning.
The courses are free to sign up and should be accessed via direct link or from the search function on the website.
Note: You do not have to complete the course although it is a good idea to have the certificate of completion.
Particularly, the R Programming course is one of the easier ways to getting started using R. Please see the direct link to the course.
The DataScience Specialization team also has a dedicated website (much like this one) to provide useful resources and links.