R-Studio
There is also a very popular GUI (Graphical User Interface) called R-Studio, which allows you to run R while having the functionality of Tinn-R.
Please know that R is not R studio. In R-Studio, R is almost hidden in the background, so it is important that you still know how to run R without R-Studio.
With that said, R-studio facilitates considerably the learning of R, the downside is to think that R-studio is R.
You can download R-studio from here; use the free version. Follow the instructions of the page to install the software.
After installation R-Studio should appear as the icon in the image below.
The next video show you for how to use R-Studio.