Empty the Recycle Bin
Delete temporary files
Use Disk Cleanup
Uninstall unused programs
Remove large files you no longer need
Clear Downloads folder
Delete duplicate files
Move files to an external drive
Move files to cloud storage
Remove old system restore points
Disable hibernation if not needed
Clear browser cache
Delete unused user accounts
Compress large files or folders
Find and remove junk files
Clean up desktop files
Remove old Windows update files
Check storage usage in Settings
Disable startup apps you do not use
Use a storage cleanup tool