1 Delete Unnecessary Apps
This probably goes without saying, but you should delete old apps or apps that you no longer use. They’re just wasting space. A good tip is to delete unused apps that perform the same basic functionality as another app you actually do use.
Just tap and hold on an app to go into “wiggle mode,” and then hit the X icon next to an app you’d like to delete. And if you’re on iOS 11, there’s a built-in feature that can do this for you. Just go to Settings > General > iPhone Storage, and make sure that Offload Unused Apps is enabled. The system will delete apps that you no longer use when you’re low on storage, but will keep the app data.