How can i delete data in the cloud that i do not want?

See the article Manage your iCloud storage - Apple Support

Delete it at iCloud.com or on any device on which iCloud is enabled. When you delete in one place, it deletes in all.

Declan-2020 Said:

"How can i delete data from the cloud i do not need?"

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Use a Computer for this:

Manage the iCloud storage through use of a computer, as it would be more user-friendly doing so. Viewing the iCloud Drive: https://www.icloud.com/iclouddrive