Use the built-in storage view
Start with categories and large items instead of deleting files at random.
Check whether photos are truly backed up
Sync status matters before deleting local copies.
Remove unused downloads and offline media
These are often safer targets than app data or system folders.
Avoid cleaner apps that make exaggerated claims
Built-in storage tools are usually the better starting point.
General consumer technology information only. Interfaces and menu names change. Before resets, reinstalls, storage changes or other major actions, verify that important data is backed up and use current manufacturer/service-provider instructions.