About this interactive
The lesson opens File Explorer on a Windows 11 PC and looks at the C: drive. Three folders there hold almost everything that matters.
C:\Windows is the operating system: the NT kernel (ntoskrnl.exe), its drivers, the fonts every app can use, and the tools that come with Windows, most of them in the System32 subfolder. You rarely need to change anything in it.
C:\Users has one folder for every account on the PC, named after the account. Inside each one are that person's Desktop, Documents, Downloads and Pictures folders, so two people sharing a PC each keep their own files. C:\Users\Public is the shared exception: every account can use it.
C:\Program Files is where installed software goes, each program in a folder of its own. On 64-bit Windows, older 32-bit programs go to a second folder, C:\Program Files (x86).
Knowing which is which tells you where to look for a missing file, what to back up (Users), and what you should not delete (Windows).
Type each folder name as File Explorer shows it, spaces included.
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