It’s an essential part of Apple’s ecosystem. Even if syncing between devices isn’t what you need because you own just one device iCloud does a lot of things for you automatically. 5 GB is free, if you want more it’s quite affordable. 50GB for €0.99 is definitely a good deal compared with other providers e.g. the well-known Dropbox, Google Drive, or Box cloud.
You’ve problems with understanding what’s going on above your head?
Read this article about Apple’s i☁️
I hope the weather is fine for you today.