Why does iCloud keep saying its full?

I deleted almost almost everything from my iPhone but a popup from iCloud keeps coming up saying iCloud can't backup my storage because it's full. Please I don't understand and it got annoying someone tell me how could I fix it

Your phone is one thing, your iCloud storage is another. What is full is the iCloud storage which is online, on the Internet. Log into it online and delete what you no longer need.
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