I wish to know how to establish free space vs usage of my disk.
Hi and welcome.
From memory, if you launch Disks, the main window should show the layout of your drives partitions and any free space you have.
You can also open "disk usage analyzer" (the terminal command to launch it is baobab).
I added the terminal command because sometimes users in other languages have problems to find the apps in Zorin menu because of translation issues.
At least that's how I felt at first, when Zorin was new to me. The translated words of the apps are often not the same as in English.
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Welcome to the Forum!
When You open Nautilus and click at the left Side on ''Other Places'', You should see then on the right Side Your System Drive with available Space:
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From experience, some things are better not translated at all and if possible, just leave them in their original language. I’m saying this as a native English Speaker in Spain. I have to use a lot of official, government apps and websites in my daily life here and trying to use them in English causes a lot of problems, so for years I’ve just left them in Spanish and learnt how to use them as they appear natively. It is amazing how quickly you learn to adapt and suddenly, everything is just intuitive. Our brains are amazing and can easily work in two (or more) languages at once. As a teacher, I’d encourage anyone whose native language isn’t English not to switch languages in Linux but to stick with English. You’ll be amazed just how quickly you adapt and how much your English will grow too, which has real-life benefits.
Also, Nautilus is the file manager. I mention this because I spent an uncomfortable few hours trying to discover how to “launch Nautilus”, having no idea what is was! Searching didn’t help either. I laugh now but it was frustrating at the time. 
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You can also enter the terminal-commands in the search field of Zorin start menu to find the app, e.g. nautilus or baobab. That works independent of the custom language.