I need to transfer my photos to iCloud to free up my space
Trying to transfer my photo to purchase iCloud
iPhone 11, iOS 13
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See: Set up and use iCloud Photos - Apple Support
Be aware 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.