How do I free up space on Windows 10 when c drive is full?

When the C drive is full. Clearing the WinSxS folder can help free up some disk space on Windows 10, but it should be done carefully to avoid removing essential system files. The WinSxS folder stores Windows component files, updates, and backup files.

Here are safe methods to free up Space Windows 10 in the WinSxS folder:

1. Use Disk Cleanup Tool

The easiest and safest way:
    Press Windows + R, type cleanmgr, and press Enter.
    Select your system drive (usually C:).
    Click on Clean up system files.
    Wait for the scan to complete.
    Check Windows Update Cleanup and other options you want to remove.
    Click OK to delete unnecessary files.

2. Use Deployment Image Servicing and Management (DISM) Tool
Advanced users can run DISM commands:
    Open Command Prompt as Administrator.
    Run the following command to clean up:

dism /online /Cleanup-Image /StartComponentCleanup

To remove older versions of updates that are no longer needed:

dism /online /Cleanup-Image /AnalyzeComponentStore

Followed by:

dism /online /Cleanup-Image /SPSuperseded

3. Automate Regular Maintenance
Windows 10 can automatically clean up using Storage Sense:
    Go to Settings > System > Storage.
    Turn on Storage Sense and configure it to delete temporary files automatically for free up space Windows 10.