Empty the Trash
Delete large files from Downloads
Remove unused apps
Uninstall app leftovers
Clear browser cache
Delete old iPhone and iPad backups
Remove duplicate files
Move photos and videos to cloud storage
Optimize Mac storage in Photos
Delete old email attachments
Clear system and user cache files
Remove language files you do not need
Delete old disk images and installers
Use Storage Management to review large files
Move documents to an external drive
Restart the Mac after cleanup