For unknown reasons, Apple only gives their customers 5GB of free iCloud space. If you compare that to what other cloud services offer, 5GB is extremely lousy and tight-fisted. This means that if you use your Apple devices to take many photos and videos (especially at high-resolution), then that 5GB will disappear faster than Rick Astley’s singing career. Therefore, you will have to upgrade your iCloud storage to a paid plan (unless you really want to spend your whole life constantly deleting stuff to crawl back a few megabytes.) Here are the options and how you upgrade, depending on what platform you’re on.
Read more: How to create or log into an iCloud account