I need help with iCloud storage And backing my phone up?

I got an iPhone 7 a month and a bit ago. The last few weeks it's been telling me to back it up, back when I do that I don't have enough iCloud storage. I don't even want iCloud? I just want my phone to quit notifying me you know? So how can I do that?

Clear space on your iCloud storage (where backups are normally stored by default) or save the full backup on a computer through iTunes.

The backup is of course for your own good in case something could go wrong.

Just disbale the the content you don't want to sync in settings