Now that we'll start working with data files, it's a good idea to get into the habit of using RStudio Projects to organize your work..
By using RStudio Projects, you can ensure all the data, code, and documentation for your projects are accessible in a single place.
To create a new project, go to File -> New Project...* from the top menu. In the window the appears, select New Directory -> New Project. Then give your project a name and choose where to save your project.
This will create a new folder in the location where you chose to save your new project. In this folder, you should now see a .Rproj file. You can use this .Rproj file as a shortcut to open your project in RStudio.