COnfused about iCloud storage
I'm trying to upgrade my software, and after downloading, I get a message that I need another 18 G of space.
I have 500 Gb drive, of which about 300 Gb shows as being on iCloud. My understanding is that if it is on iCloud, it should not be taking up space on my computer.
What is iCloud all about if not on the CLoud? I've already gone in & deleted lots & lots of stuff, but don't know how to get what is on iCloud off my computer and onto the Cloud.
When I put something on my desktop, looking at my desktop says Desktop - iCloud.
How do I clear out the drive? I'm confused.
Thanks
MacBook Air 13″, macOS 10.14