

To load a package, run library(name of the package) (this time "" around the name of the package are optional, but can still be used if you wish).

Once the package is installed, you must load the package and only after it has been loaded you can use all the functions it contains. Some packages are installed by default, all others must be installed by running install.packages("name of the package") (do not forget "" around the name of the package!). You are then able to use this package (and all functions built inside this package) for free. Remind that R is open source everyone can write code and publish it as a package. Everything else must be installed from packages. Only fundamental functionalities come with R.

The last pane (blue) is where you will find everything else such as your files, the plots, the packages, the help documentation, etc. In this pane you can also see a tab with a history of the code executed and a button to import a dataset (more on importing a dataset in RStudio). This means that you can now perform any computations with a, such that if you execute a + 1, RStudio will render 2 in the console.
