Empty the Trash
Delete large files in Downloads
Remove duplicate files
Uninstall unused apps
Delete old iPhone or iPad backups
Clear browser cache
Remove old DMG and ZIP files
Delete files from the Desktop
Move photos and videos to external storage
Use iCloud Drive or another cloud service
Remove language files and app leftovers
Clear Mail attachments
Delete old Messages attachments
Use Storage Management in Apple menu
Reduce Time Machine local snapshots
Remove unused user accounts
Clean up the Movies folder
Delete old project files and archives
Store files on an external hard drive
Restart after cleanup to refresh available space