Saving photos
Can I delete a large amount of photos from my iPad and still keep the copies in the iCloud?
I need to free up storage space on my iPad.
How do I do that?
iPad, iPadOS 13
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See the information in Set up and use iCloud Photos - Apple Support
including the "Save space on your device" section about Optimize Storage.
Note that iCloud Photos is a syncing service. Any photo you delete from a device where iCloud Photos is turned on will also be deleted from iCloud and from any other device connected to iCloud Photos. You can potentially reduce the storage space required on a device by turning on Optimize Storage.
Apple does not currently offer cloud-only storage for photos. If that is what you want or need, you may want to explore 3rd party options such as Google Photos or Dropbox.