Icloud
i don’t have memory on iphone so I bought space on icloud, but earlier I didn’t use Icloud at all. How to transfer old photos what is using my iphone memory to icloud?
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See instructions in Set up and use iCloud Photos - Apple Support
In addition to turning on iCloud Photos on your phone, be sure to turn on the Optimize iPhone Storage option described in the above article.
All of the photos currently on your iPhone should then sync to iCloud.
Also 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.
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.