Apple gives us 5Gb of iCloud storage and has done now for many years. In these days of phones regularly using 32Gb, 64Gb and even 256Gb of storage, the 5Gb storage you get for free is nowhere near enough for the majority of users. Mashable UK gives us some insight as to how to clean up your iCloud storage without having to purchase more.
https://mashable.com/video/clean-up-icloud/?europe=true