Summarize the following:
This may be in a folder labeled "Utilities."    The apps will be sorted by the amount of storage they take up. Deleting apps that you don't use can help free up a lot of space. Tap "Delete App" again to confirm and delete the app. You can download it again at any time from the App Store. Removing a lot of apps can give you space back and prevent your iPad from locking up. Music can take up a lot of space on your iPad. remove old tracks to help improve performance:  Return to the Manage Storage app list in your Settings app. Tap the "Music" option in the app list. Tap "Edit" in the upper-right corner. Tap the "-" and then "Delete" next to any music you want to remove. The iCloud Photo Library will store your originals on your iCloud account, while keeping a low-quality copy on your iPad. This will free up a lot of space if you have tons of pictures. Be aware that this will count against your iCloud storage limit:  Tap the Settings app. Tap "Photos & Camera." Toggle "iCloud Photo Library" on. Tap "Optimize Phone Storage."

Summary:
Tap the Settings app. Tap "General." Tap "Storage & iCloud Usage." Tap "Manage Storage" in the "Storage" section. Tap an app high on the list that you don't use. Tap "Delete App." Repeat to remove any apps you don't use. Delete music you don't listen to. Use the iCloud Photo Library to free up space.