a great way to learn Git easily is here https://try.github.io/
This is a much better designed code school project than the one for R
However Swirl is a great way to learn R in an interactive way. its only drawback is it needs to be integrated with something like http://www.r-fiddle.org/#/ for a true automated browser only version
Why do I favor automated elearning solutions now? Because teaching the same thing again and again can be boring for the teacher and videos can be boring for the students. Note how the potential student is given positive reinforcement to boost his morale, something any good teacher know.
DECISION STATS 