Inside your computer is a hard disk, responsible for storing data, including the operating system (called macOS), applications (AKA apps, or programs), as well as all your files. The disk is named, Macintosh HD and is represented by the icon below.
All data stored on Macintosh HD is organised into folders. To see these folders, and investigate their contents, we use an application called Finder.
Click the Finder icon in the Dock, along the bottom left of the screen.
Choose Go->Computer from the menu bar.
In the Finder window that appears, double click on the Macintosh HD icon.
Inside Macintosh HD
Inside Macintosh HD you will find four folders:
You will only ever need to access the Users and Applications.
You’ll likely never need to venture inside the System and Library folders (used to store operating system data), but we’re free to do so if we wish.