How can I delete unnecessary memory usage on my iCloud?

Hi everyone,

I'm familiar with opening up Storage where it shows you the apps and amount of memory they are using up. Do you have any other advice on where to go to get rid of some unnecessary memory usage?

I've also noticed with some of the apps on the Storage page, they may not seem to take up a lot of room, but it bases it on how much the application/software uses not including all the data saved within it.

Thanks!

[Re-Titled by Moderator]