Right now, just focus on Photo Library, as that's the space being used locally on your i Phone or i Pad.
If you have more than 1GB here, you should consider copying photos and videos to another storage space so you can delete them from your i Phone and free up a lot of space.
Scroll through the list of apps and look for apps you don't use; it's much easier to do this here than on your home screens, where apps are likely to be scattered across several pages and bunched into folders.
It's a handy feature, but the feature syncs the most recent 1,000 photos, so it can eat up space.Select any app, and a new page shows the usage into two parts: the amount of space the app itself uses (in light gray at the top) and the space used by the app's data and documents.For example, my favorite podcasting app Downcast takes up 622MB total: 17.1MB for the app and 605MB for documents and data.Both actions delete all the files associated with the entry or album.
If you want to put the music back on your device, open the Music app and go to Library.And how can you make smart decisions about what to keep and what to delete?