Perform Disk Cleanup
The built-in Disk Cleanup tool in Windows actually does a decent job of removing unnecessary files.
If you want to go further though, like finding duplicates, you’ll need a third-party tool.
1. Click the Start button, thenclick the File Explorer link
2. Right-click Local Disk C: and choose Properties
3. Under the General tab, click the Disk Cleanup button
4. Click “unnecessary files (temporary internet files, etc.),” then click OK
5. Note there’s a “Clean up system…